[U-Boot] [PATCH] sunxi: Allow booting from 128KB SD/eMMC offset

[Maxime Ripard]

On Sun, Dec 16, 2018 at 02:04:58AM +0000, Andre Przywara wrote:
> On modern Allwinner SoCs (tested: H2+, A64, H5, H6) the BootROM can
> actually load the SPL also from sector 256 (128KB) of an SD card or eMMC
> chip. For more details, see [1].
> In this case the boot source indicator (written at offset 0x28 of SRAM A1)
> has bit 4 set, so it's 0x10 for SD card and 0x12 for eMMC.
> 
> Add those new values to the existing boot source check to allow booting
> the SPL from those "high" disk offsets as well. For this to work, the
> value of CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR needs to be adjusted,
> for instance to 0x140 (right after the high SPL). Doing this dynamically
> sounds desirable, but looks nasty to implement.
> 
> [1] https://groups.google.com/forum/#!topic/linux-sunxi/MaiijyaAFjk
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>

Acked-by: Maxime Ripard <maxime.ripard at bootlin.com>

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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