Raúl Sánchez Siles wrote:
Hello all:
This is the first time I write to the list, and I appreciate the big help it gives us users.
We're using an AT91RM9200 based board called Portux920T. We have now a quite stable kernel and u-boot configuration which I attach. We manage to include a dataflash inside the portux board and get it to work. At least almost, please read on.
When doing big transfers in memory (10M), we have some kernel oopses(see panic.log.zip attached). The oops comes up in the function __wake_up_common in the file kernel/sched.c
The steps to reproduce this are the following:
1- Start the first bootloader (used the binary provided by atmel). 2- Make the first bootloader start u-boot(1.1.6). 3- U-boot downloads kernel(2.6.18) from _dataflash_ into RAM. 4- Rest of booting till shell prompt. 5- Execute for example: dd if=/dev/zero of=/root/borrar bs=1k count=10k 6- Oops!
You do not say that you are loading a ramdisk. Do you have the file system in dataflash? If not, I do not see how this can be influenced by the dd command... If it is, then the 4 MB flash seems small for a 10 MB copy!
I can see two scenarios where the dataflash can cause problems.
1) The dataflash blocksize is not 1024 bytes, it is 1056 bytes 2) You are running the dataflash > 5 Mbps The PDC of the SPI must not be starved of bus cycles, or you are in trouble unless the H/W manages chipselect through GP I/O.
I would try
$ dd if=/dev/zero of=/root/borrar bs=1056 count=10k
to start with, abnd if this works, start digging.
If we substitute step 3 for U-boot downloads kernel from _parallel flash_ into RAM, the Oops won't happen.
The kernel has been patched with the latest maxim(2.6.18) patchset for the AT91RM9200 microcontroller. The u-boot configuration is also attached (portux920T.h).
We have also tried using different first stage bootloaders we could find. Even we compile it ourselves using the RAM initialisation code taken from the u-boot. We also have tested several toolchains, from emdebian to the one provided by portux.
We have 64MB Ram and we have tried using 64MB 32bit wide and 32MB 16bit wide. Flash and Dataflash are both 4MB. We will much appreciated whatever info or test that could take out from this works but... situation. Thank you very much.
Regards,
Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&da...
U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
Best Regards, Ulf Samuelsson ulf@atmel.com GSM: +46 (706) 22 44 57 Tel: +46 (8) 441 54 22 Fax: +46 (8) 441 54 29 Mail: Box 2033 174 02 Sundbyberg Visit: Kavallerivägen 24 174 58 Sundbyberg' Sweden