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https://github.com/brain-hackers/u-boot-brain
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8829076a5b
U-Boot itself might need to identify the boot device, for example to be able to tell where to load the kernel from when several options are possible. Move the logic of spl_boot_device to a function that is compiled both for the SPL and the main binary. Tested-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
84 lines
2.9 KiB
C
84 lines
2.9 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 2
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#ifdef CONFIG_SUNXI_HIGH_SRAM
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#define SPL_ADDR 0x10000
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#else
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#define SPL_ADDR 0x0
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#endif
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/* The low 8-bits of the 'boot_media' field in the SPL header */
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#define SUNXI_BOOTED_FROM_MMC0 0
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#define SUNXI_BOOTED_FROM_NAND 1
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#define SUNXI_BOOTED_FROM_MMC2 2
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#define SUNXI_BOOTED_FROM_SPI 3
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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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/*
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* If the fel_uEnv_length member below is set to a non-zero value,
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* it specifies the size (byte count) of data at fel_script_address.
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* At the same time this indicates that the data is in uEnv.txt
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* compatible format, ready to be imported via "env import -t".
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*/
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uint32_t fel_uEnv_length;
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/*
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* Offset of an ASCIIZ string (relative to the SPL header), which
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* contains the default device tree name (CONFIG_DEFAULT_DEVICE_TREE).
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* This is optional and may be set to NULL. Is intended to be used
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* by flash programming tools for providing nice informative messages
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* to the users.
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*/
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uint32_t dt_name_offset;
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uint32_t reserved1;
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uint32_t boot_media; /* written here by the boot ROM */
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/* A padding area (may be used for storing text strings) */
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uint32_t string_pool[13];
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/* The header must be a multiple of 32 bytes (for VBAR alignment) */
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};
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/* Compile time check to assure proper alignment of structure */
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typedef char boot_file_head_not_multiple_of_32[1 - 2*(sizeof(struct boot_file_head) % 32)];
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#define is_boot0_magic(addr) (memcmp((void *)addr, BOOT0_MAGIC, 8) == 0)
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uint32_t sunxi_get_boot_device(void);
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#endif
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