[flashrom] Update bios (not full flash) with flashrom

[Mike Banon]

It could be that a manufacturer has released the same motherboards
with two various sizes of a BIOS chip. You could try padding your 256
KB image with FF's to increase its' size up to 512 KB and then flash
to the chip, after making a full backup ofcourse. Also you could look
through your existing backup, to see how much of your 512 KB image is
really occupied with anything thats not FF's, especially at the end.
Could use some simple hex editor like Okteta to quickly check this

On Tue, May 29, 2018 at 10:45 PM, Skoll RC <amisbievre at hotmail.fr> wrote:
> I have an external programmer and a full backup of my current bios. nothing
> writen, there was a label but it had to come off with time.
> How can I concatenate images? The update is not a full bios, is it?
> ________________________________
> De : David Hendricks <david.hendricks at gmail.com>
> Envoyé : mardi 29 mai 2018 19:19
> À : Skoll RC
> Cc : flashrom at flashrom.org
> Objet : Re: [flashrom] Update bios (not full flash) with flashrom
>
> On Sun, May 27, 2018 at 11:44 AM, Skoll RC <amisbievre at hotmail.fr> wrote:
>> Hi everyone,
>>
>> I would like to update my GA-8I915P-MF's bios with flashrom but Gigabyte
>> only provide updates and no full bios so when I try to update with
>> flashrom -p internal -w 8i9pmf.f2 I have an error message: Error: Image
>> size
>> (262144 B) doesn't match the flash chip's size (524288 B)!
>> How can I fix it?
>
> That's unfortunate. Do you have an external programmer (something like
> a buspirate) that can be used in case things go wrong? Can you tell if
> there is anything written to the lower half of the chip? It could be
> as simple as concatenating the 256KB image to itself to create a 512KB
> image. But I wouldn't recommend trying that unless you have a good
> means of recovering.
>
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