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: > > > > 4. 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> > > 9. 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 ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: [email protected] ===================================================================== _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
