[U-Boot] Memory problems on mpc8572ds

[Sebastian Andrzej Siewior]

* Liu Dave-R63238 | 2009-05-15 08:47:04 [+0800]:

>> (v1.3.0-rc2):
>> - ddr->sdram_mode 0x00400a62;
>> - ddr->sdram_data_init = 0x00000000;
>> - ddr->sdram_cfg_2 = 0x04401000;
>> 
>> to (v2009.03):
>> - ddr->sdram_mode 0x00440a62
>> - ddr->sdram_data_init 0xdeadbeef
>> - ddr->sdram_cfg_2 0x24401000
>> 
>> I cherry-picked commit 6a819783 aka "fsl-ddr: Fix two bugs in the ddr
>> infrastructure" but nothing improved.
>> 
>> Now I've picked v1.3.0-rc2 and linux v2.6.29. With that combination
>> everything seems to work however I experience sometimes ICE while
>> compiling. If I continue to compile from that point there is no ICE
>> anymore so it does not look like a gcc bug to me.
>> 
>> Any suggestions? Someone with similar problems?
>
>It seems like you are happening the DDR memory issue.
>Have a dump all of DDR registers for both v1.3.0-rc2 and v2009.03.
>Check if anything is different.

Those three I've posted are the only ones that have changed. I've
compared the 16 regs which are set in fixed_sdram(). Do you want me to
go through _all_ of them?
As I wrote later, with v1.3.0-rc2 I get some ICE during compile
sessions. So it looks to me like those timings are not bullet proof but
friendlier than in v2009.03

Sebastian