diff options
| author | Andre Przywara <andre.przywara@arm.com> | 2016-05-31 10:45:06 -0700 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-06-06 13:39:19 -0400 |
| commit | cdaa633fcf9c2bd54aa3c130ee727708a4e2406a (patch) | |
| tree | 0dbf826c4c9895e839d107e4b9548ee0a5fd559b /arch/arm/include/asm | |
| parent | be86492bdaeb8fdfd8d66bba79a9bd899531b8b0 (diff) | |
arm/arm64: implement a boot header capability
Some SPL loaders (like Allwinner's boot0, and Broadcom's boot0)
require a header before the actual U-Boot binary to both check its
validity and to find other data to load. Sometimes this header may
only be a few bytes of information, and sometimes this might simply
be space that needs to be reserved for a post-processing tool.
Introduce a config option to allow assembler preprocessor commands
to be inserted into the code at the appropriate location; typical
assembler preprocessor commands might be:
.space 1000
.word 0x12345678
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Steve Rae <srae@broadcom.com>
Commit Notes:
Please note that the current code:
start.S (arm64) and
vectors.S (arm)
already jumps over some portion of data already, so this option basically
just increases the size of this region (and the resulting binary).
For use with Allwinner's boot0 blob there is a tool called boot0img[1],
which fills the header to allow booting A64 based boards.
For the Pine64 we need a 1536 byte header (including the branch
instruction) at the moment, so we add this to the defconfig.
[1] https://github.com/apritzel/pine64/tree/master/tools
END
Reviewed-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch/arm/include/asm')
| -rw-r--r-- | arch/arm/include/asm/arch-bcm281xx/boot0.h | 15 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-sunxi/boot0.h | 14 |
2 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-bcm281xx/boot0.h b/arch/arm/include/asm/arch-bcm281xx/boot0.h new file mode 100644 index 0000000000..7e72882725 --- /dev/null +++ b/arch/arm/include/asm/arch-bcm281xx/boot0.h @@ -0,0 +1,15 @@ +/* + * Copyright 2016 Broadcom Corporation. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __BOOT0_H +#define __BOOT0_H + +/* BOOT0 header information */ +#define ARM_SOC_BOOT0_HOOK \ + .word 0xbabeface; \ + .word _end - _start + +#endif /* __BOOT0_H */ diff --git a/arch/arm/include/asm/arch-sunxi/boot0.h b/arch/arm/include/asm/arch-sunxi/boot0.h new file mode 100644 index 0000000000..ea5675eb9e --- /dev/null +++ b/arch/arm/include/asm/arch-sunxi/boot0.h @@ -0,0 +1,14 @@ +/* + * Configuration settings for the Allwinner A64 (sun50i) CPU + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __BOOT0_H +#define __BOOT0_H + +/* reserve space for BOOT0 header information */ +#define ARM_SOC_BOOT0_HOOK \ + .space 1532 + +#endif /* __BOOT0_H */ |