Inserting DMA causes Petalinux not to boot

Hello,
I'm experiencing a problem whenever I try to insert an AXI DMA IP into a Vivado Project: the resulting hdf, when applied to a petalinux project, inhibits the kernel from booting. All I see is a message ("Linux Kernel Starting...") and the system hangs.
I've noticed that commenting, in the pl.dtsi geneated devicetree file, the following lines which relate to the Axi DMA, the kernel boots without any issue.
axi_dma_0: dma@40400000 {
compatible = "xlnx,axi-dma";
reg = <0x40400000 0x10000>;
dma-channel@40400000 {
compatible = "xlnx,axi-dma-mm2s-channel";
xlnx,datawidth = <0x20>;
xlnx,device-id = <0x0>; };
dma-channel@40400030 {
compatible = "xlnx,axi-dma-s2mm-channel";
xlnx,datawidth = <0x20>;
xlnx,device-id = <0x0>;
Anyone has overcome this issue?

Yes, I loaded the PL correctly: I inserted a flickering LED connected to the clock to check that the Programmable Logic bitstream was correctly loaded. I think the problem must be somewhere else. PS: even trying to boot the QEMU emulator leads to the boot sequence hanging, and as soon as the DMA is removed from my PL it boots properly. I've also tried with a VDMA and it also boots without any issue.
Giorgio

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Last edited by ichase (2012-11-16 16:55:10)

hiciu,
Here is what you requested taken from emergency mode:
/etc/mkinitcpio.conf
# vim:set ft=sh
# MODULES
# The following modules are loaded before any boot hooks are
# run. Advanced users may wish to specify all system modules
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# MODULES="piix ide_disk reiserfs"
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# Order is important, and it is recommended that you do not change the
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http://pastebin.com/cZEJHVHm
dmesg
http://pastebin.com/MUGs1e9H
journalctl -b
http://pastebin.com/xgbfVJP8
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All the best,
Ian
Edit: I also wanted to mention that I was able to get rid of the syslog-ng errors previously mentioned by performing:
systemctl enable syslog-ng.service
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Last edited by ichase (2012-11-16 03:33:41)

How to check if row to be inserted will cause circular circular loop?

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Customers can add data via API, and this data, after inserted, can cause the problem explained above (loop). Therefore I need to find a way to check that these new values don't collide with the existing data in the table.
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table my_table contains
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if I insert the row and run my script, it will work OK, but only if I insert the row. Is there any way to validate this without inserting/removing the row ?
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problems using CONNECT BY
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This approach may fail to detect loops introduced by concurrent transactions if one of the transaction uses a serializable isolation level.
For example, assume there are two sessions (A and B), the table and trigger have been created, and the table is empty. Consider the following scenario.
First, session A starts a transaction with serializable isolation level:
A> SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
Transaction set.Next, session B inserts a row and commits:
B> INSERT INTO my_table (parent_id, child_id) VALUES (111, 777);
1 row created.
B> COMMIT;
Commit complete.Now, session A successfully inserts a conflicting row and commits:
A> INSERT INTO my_table (parent_id, child_id) VALUES (777, 111);
1 row created.
A> COMMIT;
Commit complete.
A> SELECT * FROM MY_TABLE;
PARENT_ID CHILD_ID
      111       777
      777       111Session A "sees" the table "as of" a point in time before session B inserted. Also, once session B commits, the lock it acquired is released.
An alternative approach that would prevent this could use SELECT...FOR UPDATE and a "table of locks" like this:
SQL> DROP TABLE MY_TABLE;
Table dropped.
SQL> CREATE TABLE MY_TABLE
2 (
3      PARENT_ID NUMBER,
4      CHILD_ID NUMBER
5 );
Table created.
SQL> CREATE TABLE LOCKS
2 (
3      LOCK_ID INTEGER PRIMARY KEY
4 );
Table created.
SQL> INSERT INTO LOCKS(LOCK_ID) VALUES(123);
1 row created.
SQL> COMMIT;
Commit complete.
SQL> CREATE OR REPLACE TRIGGER MY_TABLE_AI
2      AFTER INSERT ON my_table
3 DECLARE
4      v_count NUMBER;
5      v_lock_id INTEGER;
6 BEGIN
7      SELECT
8          LOCK_ID
9      INTO
10          v_lock_id
11      FROM
12          LOCKS
13      WHERE
14          LOCKS.LOCK_ID = 123
15      FOR UPDATE;
16
17      SELECT
18          COUNT (*)
19      INTO
20          v_count
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25
26 END MY_TABLE_AI;
27 /
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First, session A starts a transaction with serializable isolation level:
A> SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
Transaction set.Next, session B inserts a row and commits:
B> INSERT INTO my_table (parent_id, child_id) VALUES (111, 777);
1 row created.
B> COMMIT;
Commit complete.Now, when session A tries to insert a conflicting row:
A> INSERT INTO my_table (parent_id, child_id) VALUES (777, 111);
INSERT INTO my_table (parent_id, child_id) VALUES (777, 111)
ERROR at line 1:
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ORA-04088: error during execution of trigger 'TEST.MY_TABLE_AI'To show that this still handles other cases:
1. Conflicting inserts in the same transaction:
SQL> TRUNCATE TABLE MY_TABLE;
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SQL> INSERT INTO my_table (parent_id, child_id) VALUES (111, 777);
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SQL> INSERT INTO my_table (parent_id, child_id) VALUES (777, 111);
INSERT INTO my_table (parent_id, child_id) VALUES (777, 111)
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Table truncated.
SQL> INSERT INTO my_table (parent_id, child_id) VALUES (111, 777);
1 row created.
SQL> COMMIT;
Commit complete.
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INSERT INTO my_table (parent_id, child_id) VALUES (777, 111)
ERROR at line 1:
ORA-01436: CONNECT BY loop in user data
ORA-06512: at "TEST.MY_TABLE_AI", line 15
ORA-04088: error during execution of trigger 'TEST.MY_TABLE_AI'3. Conflicting inserts in concurrent, read-committed transactions:
a) First, empty out the table and start a read-committed transaction in one session (A):
A> TRUNCATE TABLE MY_TABLE;
Table truncated.
A> SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
Transaction set.b) Now, start a read-committed transaction in another session (B) and insert a row:
B> SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
Transaction set.
B> INSERT INTO my_table (parent_id, child_id) VALUES (111, 777);
1 row created.c) Now, try to insert a conflicting row in session A:
A> INSERT INTO my_table (parent_id, child_id) VALUES (777, 111);This is blocked until session B commits, and when it does:
B> COMMIT;
Commit complete.the insert in session A fails:
INSERT INTO my_table (parent_id, child_id) VALUES (777, 111)
ERROR at line 1:
ORA-01436: CONNECT BY loop in user data
ORA-06512: at "TEST.MY_TABLE_AI", line 15
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