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omap-common: SYS_BOOT-based fallback boot device selection for peripheral boot

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OMAP devices might boot from peripheral devices, such as UART or USB.
When that happens, the U-Boot SPL tries to boot the next stage (complete U-Boot)
from that peripheral device, but in most cases, this is not a valid boot device.

This introduces a fallback option that reads the SYS_BOOT pins, that are used by
the bootrom to determine which device to boot from. It is intended for the
SYS_BOOT value to be interpreted in the memory-preferred scheme, so that the
U-Boot SPL can load the next stage from a valid location.

Practically, this options allows loading the U-Boot SPL through USB and have it
load the next stage according to the memory device selected by SYS_BOOT instead
of stalling.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
This commit is contained in:
Paul Kocialkowski
2015-07-15 16:02:23 +02:00
committed by Tom Rini
parent 2cb81b6bcd
commit ed19bdaea3
2 changed files with 49 additions and 7 deletions
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4
arch/arm/include/asm/omap_common.h
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@@ -697,4 +697,8 @@ static inline u8 is_dra72x(void)
#define CH_FLAGS_CHFLASH (1 << 2)
#define CH_FLAGS_CHMMCSD (1 << 3)
#ifndef __ASSEMBLY__
u32 omap_sys_boot_device(void);
#endif
#endif /* _OMAP_COMMON_H_ */