[U-Boot] [PATCH v2 8/14] mtd: sunxi: Change U-Boot offset

[Tom Rini <trini@konsulko.com>]

On Tue, Nov 22, 2016 at 01:38:38PM +0100, Maxime Ripard wrote:

> The default U-Boot offset for the Allwinner SoCs was set to 32kB.
> 
> This was probably to try to maintain some compatibility with the current
> image that we build for the MMC where the U-Boot binary is also located at
> a 32kB offset.
> 
> However, this causes a number of issues. The first one is that it prevents
> us from using a backup SPL entirely, which is troublesome in case where the
> first would be corrupt (especially on MLC which have a higher number of
> bitflips).
> 
> We also cannot use the original MMC image on the NAND, because we need to
> prepare the SPL image to include the ECCs and randomizer settings, which
> reduces the interest of setting it at that particular offset.
> 
> It also prevents us from upgrading and flashing the U-Boot and SPLs
> independantly, since it's very likely that it will fall in the same erase
> block.
> 
> Since that default wasn't used by any board, change it for 8MB, which will
> be in an erase block of its own, all the erase blocks being multiple of
> two. The highest erase block size we encountered is 4MB, which means that
> in this particular setup, the first and second erase blocks will be for the
> SPL and its backup, and the third for U-Boot.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

Reviewed-by: Tom Rini <trini@konsulko.com>

-- 
Tom
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