[U-Boot] Incorrect memtest range on MPC8536DS

[Wolfgang Denk]

Dear Felix Radensky,

In message <4A869531.2090706 at embedded-sol.com> you wrote:
> 
> Thanks for clarifying. This platform has 512MB of RAM.
> The stack pointer is at 0x1fe2df48. Test works fine with upper
> limit set to 0x1fd2df48.

I recommend to set CONFIG_SYS_MEMTEST_END to 0x1F000000, then.

> For some reason I cannot set lower limit to 0x00000000.
> The lowest working address is 0x00000a98. At 0x00000a97
> the test hangs, and at 0x00000a96 I get the following crash:

Indeed. The exception vectors are located there, and as soon as you
overwrite these the next timer interrupt will crash your system.

> Can you (or Kumar) please explain what's going on here ?

Set CONFIG_SYS_MEMTEST_START to 0x0010000 or so.

Best regards,

Wolfgang Denk

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