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https://github.com/brain-hackers/u-boot-brain
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af654d1461
This patch extends the misc_init_r() function on sunxi boards
to test for the presence of a suitable "sunxi" SPL header. If
found, and the loader ("fel" utility) provided a non-zero value
for the boot.scr address, then the corresponding environment
variable fel_scriptaddr gets set.
misc_init_r() also sets (or clears) the "fel_booted" variable depending
on the active boot device, using the same logic as spl_boot_device().
The goal is to provide sufficient information (within the U-Boot
environment) to make intelligent decisions on how to continue the boot
process, allowing specific customizations for the "FEL boot" case.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/*
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* (C) Copyright 2007-2011
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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* Tom Cubie <tangliang@allwinnertech.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _ASM_ARCH_SPL_H_
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#define _ASM_ARCH_SPL_H_
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#define BOOT0_MAGIC "eGON.BT0"
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#define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */
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#define SPL_HEADER_VERSION 1
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/* Note: A80 will require special handling here: SPL_ADDR 0x10000 */
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#define SPL_ADDR 0x0
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/* boot head definition from sun4i boot code */
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struct boot_file_head {
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uint32_t b_instruction; /* one intruction jumping to real code */
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uint8_t magic[8]; /* ="eGON.BT0" or "eGON.BT1", not C-style str */
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uint32_t check_sum; /* generated by PC */
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uint32_t length; /* generated by PC */
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/*
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* We use a simplified header, only filling in what is needed
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* by the boot ROM. To be compatible with Allwinner tools we
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* would need to implement the proper fields here instead of
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* padding.
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*
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* Actually we want the ability to recognize our "sunxi" variant
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* of the SPL. To do so, let's place a special signature into the
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* "pub_head_size" field. We can reasonably expect Allwinner's
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* boot0 to always have the upper 16 bits of this set to 0 (after
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* all the value shouldn't be larger than the limit imposed by
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* SRAM size).
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* If the signature is present (at 0x14), then we know it's safe
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* to use the remaining 8 bytes (at 0x18) for our own purposes.
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* (E.g. sunxi-tools "fel" utility can pass information there.)
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*/
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union {
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uint32_t pub_head_size;
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uint8_t spl_signature[4];
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};
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uint32_t fel_script_address;
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uint32_t reserved; /* padding, align to 32 bytes */
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};
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#define is_boot0_magic(addr) (memcmp((void *)addr, BOOT0_MAGIC, 8) == 0)
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#endif
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