[U-Boot-Users] SDRAM Burst Read/Write Test
I think I am having problems with the UPM settings for my burst read/write. I have verified that my single read/write and refresh work by writing memory tests that write all ones, all zeros, rolling ones, and rolling zeros, and then read the patterns back to verify they were saved. How can I do the same thing to check my burst read/write? Is there a C function I can call, or do I just need to inline "lmw"? I seem to be having a similar problem to Sam, where U-Boot crashes when relocating U-Boot to SDRAM. It crashes in relocate_code, which is probably a burst read/write problem (from reading Sam's posts).
Thanks, - Jeff Stevens
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In message 20040113133142.17297.qmail@web41413.mail.yahoo.com you wrote:
I think I am having problems with the UPM settings for my burst read/write. I have verified that my single
As pointed out several hundret times before, this usually has nothing to do with the UPM setup, but is a consequence of missing or bad initialization sequence of your SDRAM chips.
verify they were saved. How can I do the same thing to check my burst read/write? Is there a C function I
Boot Linux. If it's running with a lot of network traffic (like with root filesystem mounted over NFS) you are pretty safe. For a very less reliable test, use TFTP to download a large file under U-Boot.
can call, or do I just need to inline "lmw"? I seem to be having a similar problem to Sam, where U-Boot crashes when relocating U-Boot to SDRAM. It crashes in relocate_code, which is probably a burst read/write problem (from reading Sam's posts).
Right. It crashes when the CPU starts instruction fetches from SDRAM, using burst mode to fill the cache lines.
Best regards,
Wolfgang Denk
participants (2)
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Jeff Stevens -
Wolfgang Denk