Sun,
On Thursday 23 April 2009, Grant Erickson wrote:
On 4/22/09 10:00 PM, SunNeo wrote:
I got a new board with 1GB DDRII memory and only 1 Rank, but the problem still exist.
The following is a summary of my job:
- Have performed memory test with "mtest" command at U-Boot, no error happened.
Sun:
It's been awhile since I looked at the code for mtest; however, it may not be entirely comprehensive or exhaustive depending on how you configured your u-boot build and the arguments you invoked it with. Do verify that it is operating over the largest range of RAM possible and that it is doing an array of tests (walking 1s, alternating bit patterns, etc.).
Take a look at the mem test included in the POST framework (post/drivers/memory.c). This should be more extensive.
<snip>
- Add the parameter "mem=516M" to bootargs, Linux can boot up normally.
But if add "mem=517M" to bootargs, Linux hangs.
That should be instructive. Start tweaking mtest or writing your own memory tests to tease out a pattern from that. Failing that, what other values work here? What values fail?
And I'm wondering why you are using such an old Linux kernel version. I suggest to at least test a recent arch/powerpc version. Perhaps this gives other results.
Best regards, Stefan
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