mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-12 16:07:30 +00:00
a188438175
This patch follows up on a discussion of ways to improve support
for the sunxi FEL ("USB boot") mechanism, especially with regard
to boot scripts, see:
https://groups.google.com/d/msg/linux-sunxi/wBEGUoLNRro/rHGq6nSYCQAJ
The idea is to convert the (currently unused) "pad" bytes in the
SPL header into an area where data can be passed to U-Boot. To
do this safely, we have to make sure that we're actually using
our "sunxi" flavor of the SPL, and not the Allwinner boot0.
The modified mksunxiboot introduces a special signature to the
SPL header in place of the "pub_head_size" field. This can be
used to reliably distinguish between compatible versions of sunxi
SPL and anything else (older variants or Allwinner's boot0).
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/*
|
|
* (C) Copyright 2007-2011
|
|
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
|
|
* Tom Cubie <tangliang@allwinnertech.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
#ifndef _ASM_ARCH_SPL_H_
|
|
#define _ASM_ARCH_SPL_H_
|
|
|
|
#define BOOT0_MAGIC "eGON.BT0"
|
|
#define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */
|
|
#define SPL_HEADER_VERSION 1
|
|
|
|
/* boot head definition from sun4i boot code */
|
|
struct boot_file_head {
|
|
uint32_t b_instruction; /* one intruction jumping to real code */
|
|
uint8_t magic[8]; /* ="eGON.BT0" or "eGON.BT1", not C-style str */
|
|
uint32_t check_sum; /* generated by PC */
|
|
uint32_t length; /* generated by PC */
|
|
/*
|
|
* We use a simplified header, only filling in what is needed
|
|
* by the boot ROM. To be compatible with Allwinner tools we
|
|
* would need to implement the proper fields here instead of
|
|
* padding.
|
|
*
|
|
* Actually we want the ability to recognize our "sunxi" variant
|
|
* of the SPL. To do so, let's place a special signature into the
|
|
* "pub_head_size" field. We can reasonably expect Allwinner's
|
|
* boot0 to always have the upper 16 bits of this set to 0 (after
|
|
* all the value shouldn't be larger than the limit imposed by
|
|
* SRAM size).
|
|
* If the signature is present (at 0x14), then we know it's safe
|
|
* to use the remaining 8 bytes (at 0x18) for our own purposes.
|
|
* (E.g. sunxi-tools "fel" utility can pass information there.)
|
|
*/
|
|
union {
|
|
uint32_t pub_head_size;
|
|
uint8_t spl_signature[4];
|
|
};
|
|
uint32_t fel_script_address;
|
|
uint32_t reserved; /* padding, align to 32 bytes */
|
|
};
|
|
|
|
#endif
|