[flashrom] flashrom ignoring ROM layout region

[Mark Marshall]

Hi.

I too would love for these changes to go in.  I'm currently working with a
64MB flash, and
I've got a number of problems, one of which is that flashrom tries to read
the entire flash
before doing anything (which will never be what I want...).

The other problems are:
- That most of flashrom seems to be limited to 2^24 address bits.
  (this is relatively easy to fix)
- That flashrom thinks a page is always 256 byes (I think I've found
  most cases of this, but I'm not sure.  What's the granularity flag
  for?

I've also found that flashrom doesn't always do what I expect, and I'm not
sure if this is
by design or not.  for instance, if I want to erase my entire flash chip,
it ends up calling
the sector erase on each sector, not by doing a chip-erase?  Are these
types of things
written down anywhere?

Thanks for any help,

Mark M.



On 8 February 2013 07:25, Stefan Tauner
<stefan.tauner at student.tuwien.ac.at>wrote:

> On Thu, 7 Feb 2013 16:09:45 -0800
> John Gainsborough <jgindc1 at gmail.com> wrote:
>
> > Hi Stefan.
> >
> > I am now attempting to write to a flashrom using the layout/region
> > approach. I need to write a region from a 4MB ROM to the beginning of an
> > 8MB ROM.
> > The region image from the 4MB ROM is 4,128,768 bytes == 0x3f0000 long and
> > this file is called image1.
> > I have defined the 8MB ROM layout in file called romlayout_8MB to be:
> >
> > 000000:3effff main
> > 3f0000:7fffff remainder
> >
> > i.e I want to place the contents of file image1 in to the 8MB ROM region
> > defined as main.
> >
> > I invoked flashrom as follows:
> >
> > flashrom -p buspirate_spi:dev=/dev/ttyUSB0,spispeed=250k -l romlayout_8MB
> > -i main -w image1
> >
> > The flash ROM is detected correctly, delay calculated, but then flashrom
> > immediately returns the error:
> > "image size doesn't match".
> >
> > As always, guidance/suggestions gratefully received.
>
> That's one of the other things my patches fix :)
> The image you supply with -v/-r/-w is always used to present a mapping
> of the whole chip. The layout information is only used to select the
> address range inside that mapping. So for vanilla flashrom you have to
> create an 8MB file and fill the first 4MB with the content you want and
> continue as you have done.
>
> With my patches one can add an image name to any -i parameter (e.g. -i
> main:main.img) which is then mapped to the corresponding offset. IIRC
> one has still to supply a whole image with the correct size, but if the
> needed ranges are also present as "-i images" then it would not be used
> at all. Similar for the read operations: it would create a whole image
> with a lot of 0xFFs outside the selected regions and smaller/exact
> files for the "-i images".
>
> Maybe I have some time at the weekend to integrate the patches. I think
> there is consensus that we want them in and they have been tested by a
> number of people, so i think it should not break too much :)
> --
> Kind regards/Mit freundlichen Grüßen, Stefan Tauner
>
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