[U-Boot] memory display question
Steve Iribarne
siribarne at grid-net.com
Thu Feb 25 17:03:21 CET 2010
Detlev Zundel wrote:
> Hi Steve,
>
>> I'm currently getting an error when I try to do a secure boot (internal
>> to the processor). So the next step is to verify that my u-boot image is
>> loaded where I think it should be loaded (at TEXT_BASE (0x83F0_0000)).
>>
>> When I do a md.w 0x83F00000 0x20 it display's all zero's which is wrong.
>> It should have my reset vector and some other things there. The image
>> header is really at offset 0x400.
>>
>> So I tried md.w 0x83F00400 0x20 and still all 0's.
>
> Why do you do a "md.w" to explicitely select 16-bit entities? Did you
> try without (i.e. correpsonding to .l) and .b? Maybe your system has
> problems with different access widths.
>
Yes I've tried both md.b and md.l, same deal.
>> This makes no sense because the darn thing boots!
>>
>> When I hook my Lauterbach to it and do a view memory through the JTAG
>> the memory looks as I expect. This makes complete sense because if this
>> wasn't the case I wasn't sure how my system was going to boot.
>
> What accesses do you perform in this setup to read the memory?
>
Oh good question.. I'll look at that...
Thanks.
--
Steve Iribarne
Sr. Software Engineer
Embedded Devices
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