[coreboot] ask for ideas and suggestions about CBFS support on ARM

Hamo hamo.by at gmail.com
Mon Apr 11 16:52:56 CEST 2011

On Sun, Apr 10, 2011 at 11:40 PM, Carl-Daniel Hailfinger
<c-d.hailfinger.devel.2006 at gmx.net> wrote:
> Hi Hamo,
> I wrote a CBFS design change proposal ~2 years ago which handled such issues
> just fine, but IIRC nobody had time to comment. I can try to dig it up
> again.
> Regards,
> Carl-Daniel

Can you send your change to me? Thanks.
> Am 10.04.2011 14:49 schrieb Hamo:
>> Dear lists,
>> I have be studying CBFS filesystem these days. Since coreboot only
>> supports IA32 architecture now, the CBFS has hard-coded boot address
>> and all the boot-related code and master header are located at around
>> 0xFFFFFFF0. But as ARM read their first instruction at 0x0, we need
>> change the CBFS filesystem but not destroy IA32 support. When porting
>> to ARM, how should the rom be organized? I have 2 ideas:
>> 1. Totally rewrite the CBFS structure on ARM according to that one on
>> IA32 to meet the requirement of ARM architecture, including move the
>> reset code and bootblock to the start of ROM(at address 0x0) and put
>> all the other components follow them. In this way, we should rewrite
>> the CBFStool and add a new option to CBFStool to tell it the
>> architecture we are using.
>> 2. Use the same structure on IA32 architecture but set the master
>> header's offset to other value than 0x0 so that we can put boot code
>> at the start of rom.
>> Which one should I take or Do we have any better choice?
>> Hope for your help.
> --
> http://www.hailfinger.org/

    Keep It Simple,Stupid.

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