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

[Pradeep Ch]

Hello David,

Thanks for commands usage .

For the command:
dd if=test2.bin of=test.bin bs=1 seek=$((0x1a1e0)) conv=notrunc

It is subtle when you are mentioning bs=1, If we donot specify bs, it will
take a default value of 512 I suppose, then seek will be (0x1a1e0)*512
which will skip lot of bytes from the beginning of the file.

 So, we cannot use a layout file to write to a specific region.

Rgds,




On Tue, Aug 2, 2016 at 1:31 AM, David Hendricks <dhendrix at chromium.org>
wrote:

>
>
> On Mon, Aug 1, 2016 at 9:59 AM, Pradeep Ch <shanmugp at sysargus.com> 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" <urjaman at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> On Mon, Aug 1, 2016 at 10:33 AM, Pradeep Ch <shanmugp at sysargus.com>
>>> 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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>>
>
>
>
> --
> David Hendricks (dhendrix)
> Systems Software Engineer, Google Inc.
>
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