[Buildroot] [PATCH 1/1] boot/uboot: add config option for uboot environment padding byte
Yann E. MORIN
yann.morin.1998 at free.fr
Wed Dec 13 18:23:32 UTC 2017
Thomas, Johannes, All,
On 2017-12-12 06:27 +0100, Thomas Petazzoni spake thusly:
> On Mon, 11 Dec 2017 19:47:08 +0100, Johannes Schmitz wrote:
[--SNIP--]
> > +config BR2_TARGET_UBOOT_ENVIMAGE_PADDING_BYTE
> > + hex "Padding byte"
> > + default 0x00
> > + help
> > + The byte used for padding at the end of the environment image.
>
> I'm still not sure what is the point of customizing the padding byte.
> Does someone has a use-case for that ? If not, I'm not sure it makes
> sense to add a Buildroot option for it.
As far as I understand, this is because the U-Boot on Johannes' board
would expect the padding byte to be 0x00 when the default for mkenvimage
is 0xFF.
I have no idea why U-Boot expects 0x00 in Johannes' case, though. The
only thing I can think of is that the 'default' byte value on flash
after a page-erase depends on the technology: for NOR, the value after
erase ix 0x00, while for NAND, it is 0xFF. So maybe that's the reason...
But any case, as you said in a further reply, adding that new option
does not add much complexity.
Reviewed-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Regards,
Yann E. MORIN.
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