Custom u-boot in PetaLinux

Hello!
I am new to PetaLinux development and running into an issue trying to use custom u-Boot source.
I am following the instructions from here: http://www.wiki.xilinx.com/PetaLinux+Getting+Started
It tells me to place new source to <PROJECT_ROOT>/components/
linux-host> git clone git://github.com/Xilinx/u-boot-xlnx.git
linux-host> cd u-boot-xlnx
I checked out xilinx version of uBoot and placed it in components/u-boot/u-boot-xlnx
I then ran petalinux-config and selected u-boot-xlnx as my new u-boot source.
When I run petalinux-build I get an error though:
[localhost Avnet-Digilent-ZedBoard-2014.4]$ petalinux-build -c u-boot
INFO: Checking component...
INFO: Generating make files and build linux/u-boot
INFO: Generating make files for the subcomponents of linux/u-boot
INFO: Building linux/u-boot
[INFO ] update linux/u-boot source
[INFO ] generate linux/u-boot configuration files
[ERROR] make[3]: *** [zynq_zc70x_defconfig] Error 1
[ERROR] make[2]: *** [zynq_zc70x_config] Error 2
[ERROR] make[1]: *** [sub-make] Error 2
ERROR: Failed to build linux/u-boot
build/build.log contains the following lines:
[ALL ] make[2]: Entering directory `/home/axion/Avnet-Digilent-ZedBoard-2014.4/
build/linux/u-boot/u-boot-xlnx'
[ALL ] GEN ./Makefile
[ALL ] drivers/Kconfig:3: can't open file "drivers/core/Kconfig"
[ERROR] make[3]: *** [zynq_zc70x_defconfig] Error 1
[ERROR] make[2]: *** [zynq_zc70x_config] Error 2
[ALL ] make[2]: Leaving directory `/home/axion/Avnet-Digilent-ZedBoard-2014.4/b
uild/linux/u-boot/u-boot-xlnx'
[ERROR] make[1]: *** [sub-make] Error 2
[ALL ] make[1]: Leaving directory `/home/axion/Avnet-Digilent-ZedBoard-2014.4/b
uild/linux/u-boot/src/u-boot-xlnx'
[ALL ] make: *** [/home/axion/Avnet-Digilent-ZedBoard-2014.4/build/linux/u-boot
/u-boot-xlnx/include/config.h] Error 255
[ALL ] make: Leaving directory `/home/axion/Avnet-Digilent-ZedBoard-2014.4/buil
d/linux/u-boot'
Apparently u-boot source was never copied to <PROJECT_ROOT>/build folder. Is there anything else I should do?
I'd like to be able to use petalinux tools (petalinux-build, petalinux-package, etc.) since it is very straight-forward. Plus it is very convenient to have configuration files in subsustems/linux/configs
Thank you very much.

Thank you!
However, I run into the same problem when I exectue petalinux-build -c u-boot
[axion@localhost u-boot-xlnx]$ petalinux-build -c u-boot
INFO: Checking component...
INFO: Generating make files and build linux/u-boot
INFO: Checking if the remote url is a valid git remote repository!
INFO: Fetching remote component u-boot
Cloning into '/home/axion/Avnet-Digilent-ZedBoard-2014.4/build/linux/u-boot/download/u-boot-xlnx'...
remote: Counting objects: 11271, done.
remote: Compressing objects: 100% (9828/9828), done.
remote: Total 11271 (delta 1749), reused 5145 (delta 1093), pack-reused 0
Receiving objects: 100% (11271/11271), 13.39 MiB | 325.00 KiB/s, done.
Resolving deltas: 100% (1749/1749), done.
INFO: Generating make files for the subcomponents of linux/u-boot
INFO: Building linux/u-boot
[INFO ] update linux/u-boot source
[INFO ] generate linux/u-boot configuration files
[ERROR] make[3]: *** [zynq_zc70x_defconfig] Error 1
[ERROR] make[2]: *** [zynq_zc70x_config] Error 2
[ERROR] make[1]: *** [sub-make] Error 2
ERROR: Failed to build linux/u-boot
=========================
From build.log:
[INFO ] generate linux/u-boot configuration files
[ALL ] make O=/home/axion/Avnet-Digilent-ZedBoard-2014.4/build/linux/u-boot/u-b
oot-xlnx -C /home/axion/Avnet-Digilent-ZedBoard-2014.4/build/linux/u-boot/src/u-
boot-xlnx -j2 zynq_zc70x_config || exit 255
[ALL ] make[1]: Entering directory `/home/axion/Avnet-Digilent-ZedBoard-2014.4/
build/linux/u-boot/src/u-boot-xlnx'
[ALL ] make[2]: Entering directory `/home/axion/Avnet-Digilent-ZedBoard-2014.4/
build/linux/u-boot/u-boot-xlnx'
[ALL ] GEN ./Makefile
[ALL ] HOSTCC scripts/basic/fixdep
[ALL ] HOSTCC scripts/kconfig/conf.o
[ALL ] SHIPPED scripts/kconfig/zconf.tab.c
[ALL ] SHIPPED scripts/kconfig/zconf.lex.c
[ALL ] SHIPPED scripts/kconfig/zconf.hash.c
[ALL ] HOSTCC scripts/kconfig/zconf.tab.o
[ALL ] HOSTLD scripts/kconfig/conf
[ALL ] drivers/Kconfig:3: can't open file "drivers/core/Kconfig"
[ERROR] make[3]: *** [zynq_zc70x_defconfig] Error 1
[ERROR] make[2]: *** [zynq_zc70x_config] Error 2
[ALL ] make[2]: Leaving directory `/home/axion/Avnet-Digilent-ZedBoard-2014.4/b
uild/linux/u-boot/u-boot-xlnx'
[ERROR] make[1]: *** [sub-make] Error 2
[ALL ] make[1]: Leaving directory `/home/axion/Avnet-Digilent-ZedBoard-2014.4/b
uild/linux/u-boot/src/u-boot-xlnx'
[ALL ] make: *** [/home/axion/Avnet-Digilent-ZedBoard-2014.4/build/linux/u-boot
/u-boot-xlnx/include/config.h] Error 255
[ALL ] make: Leaving directory `/home/axion/Avnet-Digilent-ZedBoard-2014.4/buil
d/linux/u-boot'
drivers/Kconfig file does contain a line 'source "drivers/core/Kconfig"' however, there is no folder named 'core' in under u-boot-xlnx/drivers

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***** HOW TO BACKUP A ZFS BOOT DISK TO ANOTHER DISK *****
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Regards.
HL

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logout
Looks good - 12345768 is our testing serial number! Everything seems ok at this point...
5. But when I try to read / write additional registers, I don't get anything:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <fcntl.h>
static const unsigned VX_BASE_ADDR = 0x68A00000;/* base address of the "serial number" */
static const unsigned VX_LED_ADDR = 0x41200000;/* LED control register */
static const unsigned VX_RDOUT_DUR_REG_ADDR = 0x00000015;/* offset from VX_BASE_ADDR */
int main(int argc, char *argv[]) {
/* initialize values */
int fd, value = 0;
unsigned page_addr, page_offset;
unsigned *basePtr, *ledPtr;
unsigned page_size = sysconf(_SC_PAGESIZE);
/* open /dev/mem file */
fd = open ("/dev/mem", O_RDWR | O_SYNC);
if (fd < 1) {
perror(argv[0]);
return (-1);
/* mmap the reg address into memory */
page_addr = (VX_BASE_ADDR & (~(page_size-1)));
page_offset = VX_BASE_ADDR - page_addr;
basePtr = mmap(NULL, page_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, page_addr);
/* read value at address */
value = *((volatile unsigned *)(basePtr + page_offset));
printf("%08x\n",value);
/* write value out to address */
printf("Before Write: %08x\n", *((volatile unsigned *)(basePtr + (VX_RDOUT_DUR_REG_ADDR << 2))));
*((volatile unsigned *)(basePtr + (VX_RDOUT_DUR_REG_ADDR << 2))) = 0xff;
sleep(1);
printf("After Write: %08x\n", *((volatile unsigned *)(basePtr + (VX_RDOUT_DUR_REG_ADDR << 2))));
/* mmap the LED address into memory */
page_addr = (VX_LED_ADDR & (~(page_size-1)));
page_offset = VX_LED_ADDR - page_addr;
ledPtr = mmap(NULL, page_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, page_addr);
/* turn on LEDs */
*((volatile unsigned *)(ledPtr + page_offset)) = 0xff;
/* sleep to confirm LED */
sleep(2);
/* release memory */
munmap(basePtr, page_size);
munmap(ledPtr, page_size);
return (0);
Output:
root@Xilinx-ZC702-2014_4:~# echo $PWD'>'
/home/root>
root@Xilinx-ZC702-2014_4:~#
root@Xilinx-ZC702-2014_4:~# /home/root/vx_test.elf
12345678
Before Write: 00000000
After Write: 00000000
root@Xilinx-ZC702-2014_4:~#
root@Xilinx-ZC702-2014_4:~# exit
logout
(No LEDs have turned on).
6. I created this test application using our system_stub.hdf, and it seems to have mapped everything appropriately:
I'm pretty new to all of this, so it's unclear to me the best way to make sure the userspace application is informed about the hardware.
Am I supposed to initialize the FPGA fabric in some way before trying to access these registers? Am I missing any obvious (or non-obvious) steps?
Any help you can provide would be greatly appreciated.
Thanks,
Greg

Hi,
in the same spirit,
With Board zc702
Petalinux 2015.2,
Create a new project from bsp file ,
petalinux-create -t project -s ./Xilinx-ZC702-v2015.2-final.bsp -n test703
After copy the content of the subfolder 'test703/pre-built/linux/images' on a SD-card,
The system start correctly,
After logon a simple:
poke 0x41200000 0 will hangs the system,
I tried this project after some tests with other board and projects coming from vivado,
It's always the same,
For me the problem comes from the FCLK_CLK0, this signal disappear after the boot,
The system hang because this clock is used by the AXI interfaces.
Before I used petalinux 2014.2, it was ok for this function.
All tests are ok with standalone os.
Best regards.
Gérard.

Booting off a clean hard drive.....

Hello, everyone....
I am running ZENworks 7 and I think it is fairly up to date.
I have a laptop with a clean hard drive. The drive was formatted and then it
was put into a Lenovo T500 laptop. As far as I know, it have never been
touched by anything ZENworks related.
Now, when I boot up the computer, a ZENworks pre-boot sequence starts.
How do I get this to stop? I would like it see the message that there is no
operating system.
Thanks.
Delon E. Weuve
Senior Network Engineer
Office of Auditor of State
State of Iowa
United States of America

Boot from the imaging iso cd
select Custom to boot up and get a linux prompt
dd if=/dev/zero of=/dev/hda count=64
sync
reboot
The above process is non reversible - all partitions will be lost. So be sure you are erasing the correct system. :-)
This blasts the MBR, image safe data, and makes the disk look factory fresh. Its easy to construct a bootab Linux DVD that does this in an unattended way in case you have a lot of workstations to process. Its also a good way of getting rid of MBR root kits which re-imaging will not get rid of.
-- Bob

Firefox 4 freezes, takes 3 min to load pages, does not multitask.help!

Subject: FIREFOX 4 HAS RENDERED MY BROWSING ABILITIES TO NIL.
Date: Fri, 25 Mar 2011 19:44:51 -0700
I loaded it on this past Thursday. It NEVER worked.
It may be the fact that I have a 8 year old custom dual boot =
(XP/Linux) laptop. A wholesale blind update of drivers is a BAD idea. Do you have a tool to run diagnostics on an installation of Firefox? I feel as if I have suddenly been stranded on a desert
island -- no rum or Johnny Depp either. PUL--eeeese can I get my old Firefox 3.6.7(?) back?
It was painless, efficient and reliable. If not, I definitely think you owe me some rum and a reasonable facsimile of Johhny Depp.
From troubleshooting under help:
Application Basics Name Firefox=20
Version 4.0=20
User Agent Mozilla/5.0 (Windows NT 5.1; rv:2.0) Gecko/20100101 =
Firefox/4.0=20
Profile Directory Open Containing Folder =20
Enabled Plugins about:plugins =20
Build Configuration about:buildconfig =20
Extensions=20
Name Version Enabled ID =20
Ancestry.com Advanced Image Viewer 1.0.0.1 true =
[email protected]=20
ShopAtHome.com Intelligent Shopping Toolbar 5.2.0.0 false =
[email protected]=20
Google Toolbar for Firefox 7.1.20101113Wb1 true =
{3112ca9c-de6d-4884-a869-9855de68056c}=20
Java Console 6.0.15 true {CAFEEFAC-0016-0000-0015-ABCDEFFEDCBA}=20
Java Console 6.0.21 true {CAFEEFAC-0016-0000-0021-ABCDEFFEDCBA}=20
Microsoft .NET Framework Assistant 1.0 false =
{20a82645-c095-46ed-80e3-08825760534b}=20
Norton IPS 2.0 true {BBDA0591-3099-440a-AA10-41764D9DB4DB}=20
Norton Toolbar 4.6 false {2D3F3651-74B9-4795-BDEC-6DA2F431CB62}=20
Java Quick Starter 1.0 true [email protected]=20
Xmarks 3.9.5 false [email protected]=20
Yahoo! Toolbar 2.3.5.20110120033202 false =
{635abd67-4fe9-1b23-4f01-e679fa7484c1}=20
Modified Preferences=20
Name Value =20
accessibility.typeaheadfind true=20
accessibility.typeaheadfind.flashBar 0=20
browser.fixup.alternate.enabled false=20
browser.history_expire_days.mirror 180=20
browser.places.importBookmarksHTML false=20
browser.places.importDefaults false=20
browser.places.leftPaneFolderId -1=20
browser.places.migratePostDataAnnotations false=20
browser.places.smartBookmarksVersion 2=20
browser.places.updateRecentTagsUri false=20
browser.startup.homepage =
http://www.google.com/ig?source=3Dmpues&hl=3Den=20
browser.startup.homepage_override.buildID 20110318052756=20
browser.startup.homepage_override.mstone rv:2.0=20
browser.tabs.warnOnClose false=20
browser.zoom.full false=20
extensions.lastAppVersion 4.0=20
font.minimum-size.x-western 12=20
font.name.serif.x-western Trebuchet MS=20
font.size.variable.x-western 18=20
gfx.blacklist.direct2d 3=20
gfx.blacklist.layers.direct3d10 3=20
gfx.blacklist.layers.direct3d10-1 3=20
gfx.blacklist.layers.direct3d9 3=20
gfx.blacklist.layers.opengl 3=20
gfx.blacklist.webgl.angle 3=20
gfx.blacklist.webgl.opengl 3=20
network.cookie.prefsMigrated true=20
places.history.expiration.transient_current_max_pages 20792=20
places.last_vacuum 1299877639=20
print.print_printer hp deskjet 5100 series=20
print.printer_hp_deskjet_5100_series.print_bgcolor false=20
print.printer_hp_deskjet_5100_series.print_bgimages false=20
print.printer_hp_deskjet_5100_series.print_command =20
print.printer_hp_deskjet_5100_series.print_downloadfonts false=20
print.printer_hp_deskjet_5100_series.print_edge_bottom 0=20
print.printer_hp_deskjet_5100_series.print_edge_left 0=20
print.printer_hp_deskjet_5100_series.print_edge_right 0=20
print.printer_hp_deskjet_5100_series.print_edge_top 0=20
print.printer_hp_deskjet_5100_series.print_evenpages true=20
print.printer_hp_deskjet_5100_series.print_footercenter =20
print.printer_hp_deskjet_5100_series.print_footerleft =20
print.printer_hp_deskjet_5100_series.print_footerright &D=20
print.printer_hp_deskjet_5100_series.print_headercenter =20
print.printer_hp_deskjet_5100_series.print_headerleft =20
print.printer_hp_deskjet_5100_series.print_headerright &U=20
print.printer_hp_deskjet_5100_series.print_in_color true=20
print.printer_hp_deskjet_5100_series.print_margin_bottom 0.5=20
print.printer_hp_deskjet_5100_series.print_margin_left 0.5=20
print.printer_hp_deskjet_5100_series.print_margin_right 0.5=20
print.printer_hp_deskjet_5100_series.print_margin_top 0.5=20
print.printer_hp_deskjet_5100_series.print_oddpages true=20
print.printer_hp_deskjet_5100_series.print_orientation 0=20
print.printer_hp_deskjet_5100_series.print_pagedelay 500=20
print.printer_hp_deskjet_5100_series.print_paper_data 1=20
print.printer_hp_deskjet_5100_series.print_paper_height 11.00=20
print.printer_hp_deskjet_5100_series.print_paper_size_type 0=20
print.printer_hp_deskjet_5100_series.print_paper_size_unit 0=20
print.printer_hp_deskjet_5100_series.print_paper_width 8.50=20
print.printer_hp_deskjet_5100_series.print_reversed false=20
print.printer_hp_deskjet_5100_series.print_scaling 1.00=20
print.printer_hp_deskjet_5100_series.print_shrink_to_fit true=20
print.printer_hp_deskjet_5100_series.print_to_file false=20
=
print.printer_hp_deskjet_5100_series.print_unwriteable_margin_bottom 0=20
print.printer_hp_deskjet_5100_series.print_unwriteable_margin_left =
0=20
=
print.printer_hp_deskjet_5100_series.print_unwriteable_margin_right 0=20
print.printer_hp_deskjet_5100_series.print_unwriteable_margin_top =
0=20
privacy.clearOnShutdown.cookies false=20
privacy.cpd.cookies false=20
privacy.sanitize.migrateFx3Prefs true=20
privacy.sanitize.promptOnSanitize false=20
security.warn_viewing_mixed false=20
Graphics=20
Adapter Description SiS 650=20
Vendor ID 1039=20
Device ID 6325=20
Adapter RAM Unknown=20
Adapter Drivers SiSGRV=20
Driver Version 6.14.10.2220=20
Driver Date 1-7-2004=20
Direct2D Enabled Blocked on your graphics card because of =
unresolved driver issues.=20
DirectWrite Enabled false (0.0.0.0, font cache n/a)=20
WebGL Renderer (WebGL unavailable)=20
GPU Accelerated Windows 0/1=20
Please try to help.
Annette Lee
[email protected]
-

Hi,
depends on whether you control the BPM task flow or not. If you do, have a look at this thread for how to debug the problem
How to debug "Attempt to validate an already invalid RegionSite"?
Otherwise, post it to the SOA forum if this is initiated by their generated code. The most common reason though is that the task flow lacks a default activity. So if the default activity is somewhat calculated dynamically in your application then this may be a reason
Frank

[SOLVED]How to patch the kernel? And other questions

Like the same user who started this thread I'm suffering from hibernation resuming troubles using kernel 2.6.38. In that thread was posted a soluttion that involves patching the kernel.
The patch to apply is this:
http://git.kernel.org/?p=linux/kernel/g … e3e9fc8684
Waiting for the bug to be corrected and a new version supplied is not an option, because this laptop is my main computer and I heavly rely on hibernation.
Here's my trouble now. I don't know if it is possible to patch without recompiling the whole kernel, or it has to be compiled with that patch applied. I have seen the archlinux's wiki guide about compiling the kernel, but found nothing about applying patches (maybe I didn't searched with enought depth).
In case there is needed a full compilation, should I use the vanilla kernel, the Arch Linux one or any of the AUR ones (I said AUR because they're the first that came to my mind)? Should i expect a performance gain with this (apart from fixing the hibernation bug)?
Maybe i'm just doing a bunch of dumb questions, and the only thing I need is to search deeply on the wiki. In that case, please tell me. If not, I rather get some answers around kernel patching and / or compiling questions.
Edit: In addittion, it is possible that all this questions are just newbie ones, I don't know, but as I am willing to learn from this I will appreciate any info or documentation about it.
Thank you.
Last edited by ethail (2011-04-12 06:30:48)

From the source tree (/usr/src/linux-whatever) execute
patch -p1 < /path/to/fix.patch
then recompile kernel from the source tree.
Basically that consists of executing the following commands from the source tree:
make menuconfig
make
make modules_install
cp -v System.map /boot/System.map-CUSTOM
cp -v arch/x86/boot/bzImage /boot/vmlinuz-CUSTOM
mkinitcpio -k 2.6.38-CUSTOM -g /boot/kernel-CUSTOM.img
and you need to add menu entry in /boot/grub/menu.lst
-k 2.6.38-CUSTOM should corespond to /lib/modules/2.6.38-CUSTOM (replace 2.6.38-CUSTOM with the name of your module directory, name depends on the kernel version and suffix that you gave in menuconfig). Regarding kernel configuration in menuconfig - I can't help you, you could use arch stock kernel config (zcat /proc/config.gz > /usr/src/linux-whatever/.config)
I do these kind of things this way - maybe someone else have a more elegant solution.

System Recovery that worked for me.

I've read soooooooo many complaints about Toshiba purchasers being unable to restore their laptops with their XP Recovery Discs. The usual answer from the experts on this site is that you need a new disc or your DVD drive is defective. Of course, you can find out if the latter problem is the culprit by putting in any CD/DVD with information on it then go to Windows Explorer and see if you can access anything on it. If you can't or if the only thing you can do is boot to the BIOS, then this might work for you.
For some reason a lot of these Recovery Discs simply won't start without first formatting the hard disc--I've found this to be the case with Toshiba and Gateway products. Of course, if you can't format the hard disc with the Recovery Disc then the only thing to do is this:
Find yourself a full or upgrade version of Windows XP. I haven't tried it, but you can probably also use 98, ME, 2000--whatever. Start your computer, hit the F1 key or whatever it takes to get to the BIOS. When your in you're in your BIOS, change the boot order from Hard Disc to DVD. Hit the Save key which will reboot your computer. At the Toshiba logo, hit the eject button on your DVD drive. Put in the XP disc I mentioned earlier. You should get to the start of the install process. If so, go through the entire install process and when you get to the format hard disc part, let it rip. Once the format process if finished, hit the eject button on your DVD drive. Put in the Recovery Disc that came with your computer. Reboot it, keeping the boot order the same (DVD first). The install procedure of your Restore Disc should start automatically. If it doesn't, then this procedure won't work for you.
However, I've found this procedure works on my Toshiba laptop, more than a few Gateway laptops and even a Gateway PC.
Although I haven't tried it, you can probably do the format procedure with a custom XP boot disc that you can get off the web. And if you can't do it either way yet have access to a floppy drive (USB or built into your computer), go to this Microsoft web site to down load an fabricate a set of floppies that will do the same job: http://support.microsoft.com/kb/310994
Whatever you do, don't take the expert's advice on this forum to immediately order another Recovery Disc AND don't assume that your DVD drive doesn't work. Probably neither is the case and you'll save a lot of money if it isn't.
Try this procedure first--you've got nothing to lose if you can't get past the BIOS.

hyjanks wrote:
Look. You're talkin' Geekdom here, buddy. I'm just trying to solve a problem for the average Joe whose eyes gloss over at the mention of ISO's. Toshiba tech support costs $25 for the first call. I don't know what a copy of a Recovery disc costs, but it's probably in the same range. If you go out an buy a USB/floppy dirve it will cost you about $20. And when you're through with the install, you've got yourself a new toy. When you're done with Toshiba tech support, you MAY get a solution. You MAY not. If you buy a Restore disc, it may solve the problem. Maybe it won't. Get it?
I just bought a brand-new Intel MB that comes with a SATA/RAID floppy. What do you suppose I'm going to use to install the driver?
By the way, you got a better solution?
If the computer has a floppy drive then the F6 method will work. I've used it numerous times on systems that have one. But the problem is that laptops don't have floppy drives these days, USB floppy drives don't always work for the installing SATA drivers via the F6 method, and most users don't know how to make an F6 floppy disk to use. And many laptops don't even provide the files to create an F6 SATA driver floppy. It's a lot easier to burn a CD from an ISO that is readily available than it is to create a F6floppy disk when you don't have the preconfigured disk file and need to create one from scratch.
Now why are we arguing anyway? Both methods will work. It's just a matter of which will be more appropriate for the specific situation. I'm not attacking you, your method, or your manhood. Now let's just drop this as it's not productive and is actually going to confuse some of the people that would potentially benefit from these methods.
If you don't post your COMPLETE model number it's very difficult to assist you. Please try to post in complete sentences with punctuation, capitals, and correct spelling. Toshiba does NOT provide any direct support in these forums. All support is User to User in their spare time.

Can Windows XP run on a Snow Leopard Mac?

Hi,
Let me just start by saying that I have a version of Windows XP that I have modified to be able to boot and run on a USB drive, regardless of whether or not that drive is a flash drive or a hard disk. I have installed that Windows XP on a flash drive, even fixed its master boot record and customized the boot.ini file and added the ntldr file and the ntdetect.com file and my Mac which is a Mid-2010 (MacBookPro 7,1) refuses to recognize the disk even though it is recognized and runs fine on a PC. Can anyone explain what the problem is?
Thanks, Chris

Yes, it does. However, the way OS X formats a GUID partition is much different than the way that Windows formats it. I believe what I am trying to do is possible, but it is extremely tricky.
The bottom line is that you have to plug the USB drive into a SATA/ESATA conversion connector on a PC because Windows won't let you create a Microsoft protected partition on a removable drive, so you have to trick it into thinking that it is a normal disk.
After freeing all of the space on the disk, you run diskpart as an administrator
DISKPART> list disk
DISKPART> select disk <the disk you want>
DISKPART> convert gpt
DISKPART> create efi partition size=102
DISKPART> create msr partition (create a microsoft protected partition; however, this command will fail on a removable drive)
DISKPART> create primary partition size=<the size in MB you want> ID=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
DISKPART> list partition
DISKPART> select partition <the partition you want to format NTFS>
DISKPART> format fs=ntfs
DISKPART> active
DISKPART> assign
<create more partitions if you want; otherwise, exit DISKPART>
Next, you must turn on BootCamp because the installer needs some FAT32 or NTFS space to work with during its installation. Insert the Windows installation CD and then enter setup. Select the partition you want to install Windows to and press enter. Now, Windows should be able to start from the drive attached as a USB drive again. If it does not then you need a Windows install CD that has a repair functionality. Wait until Windows setup loads and then make sure you have the correct partition then press R to enter the repair console and it will ask you which Windows installation you want to work with. Make sure you select the correct installation number then type fixmbr and enter and type y and enter to the warning presented. Then restart the computer and you should be able to select the USB drive on either a Mac or PC. You have to use the very specific ID above because it is the only ID that Windows XP recognizes with respect to GUID partitions.

Custom u-boot in PetaLinux

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