Re: [flashrom] Writing to a specific Flash region with Layout approach

[David Hendricks]

On Mon, Aug 1, 2016 at 9:59 AM, Pradeep Ch  wrote:
> How do I pad the bootloader. img to 8MBytes ? But, still it occupies the
> first 106976 Bytes right ? Remaining space is empty I suppose.

To create a 8MB file full of 0xff bytes:
dd if=/dev/zero bs=1k count=8192 2>/dev/null | tr "\000" "\377" > test.bin
> From there, you can use dd with skip=, seek=, and conv=notrunc to place

your content wherever you need to in the image. For example,
dd if=test1.bin of=test.bin bs=1 conv=notrunc
dd if=test2.bin of=test.bin bs=1 seek=$((0x1a1e0)) conv=notrunc

Thanks.
> On Aug 1, 2016 9:08 PM, "Urja Rannikko"  wrote:
> > Hi,
> >
> > On Mon, Aug 1, 2016 at 10:33 AM, Pradeep Ch 
> > wrote:
> > > I am attempting to write to a flashrom using layout/region approach.
> > > The NOR flash size is 8MBytes. The file size I am writing is 106976
> >
> > Bytes.
> > > The rom.layout file contents are:
> > >  00000000:0001a1df test1
> > >  0001a1e0:007fffff test2
> > >
> > > The command I am using is:
> > > ./flashrom -p ft2232_spi:type=arm-usb-ocd --layout rom.layout --image
> >
> > test1
> > > -w bootloader.img
> > >
> > > The error I am getting is :
> > > Using region: "test1".
> > > Calibrating delay loop... OK.
> > > Found Eon flash chip "EN25Q64" (8192 kB, SPI) on ft2232_spi.
> > > Error: Image size (106976 B) doesn't match the flash chip's size
> >
> > (8388608
> > > B)!
> > >
> > > Please let me know about the error.
> >
> > The current layout system will only limit the actually written area,
> > not change the requirements of the flash file being the size of the
> > chip, so in this case you'd need to pad the bootloader.img to 8MB.
>
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