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https://github.com/brain-hackers/u-boot-brain
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067e0b9684
On modern Allwinner SoCs (tested: H2+, A64, H5, H6) the BootROM can actually load the SPL also from sector 256 (128KB) of an SD card or eMMC chip. For more details, see [1]. In this case the boot source indicator (written at offset 0x28 of SRAM A1) has bit 4 set, so it's 0x10 for SD card and 0x12 for eMMC. Add those new values to the existing boot source check to allow booting the SPL from those "high" disk offsets as well. For this to work, the value of CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR needs to be adjusted, for instance to 0x140 (right after the high SPL). Doing this dynamically sounds desirable, but looks nasty to implement. [1] https://groups.google.com/forum/#!topic/linux-sunxi/MaiijyaAFjk Signed-off-by: Andre Przywara <andre.przywara@arm.com> Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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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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#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_MAJOR_BITS 3
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#define SPL_MINOR_BITS 5
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#define SPL_VERSION(maj, min) \
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((((maj) & ((1U << SPL_MAJOR_BITS) - 1)) << SPL_MINOR_BITS) | \
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((min) & ((1U << SPL_MINOR_BITS) - 1)))
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#define SPL_HEADER_VERSION SPL_VERSION(0, 2)
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#define SPL_ENV_HEADER_VERSION SPL_VERSION(0, 1)
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#define SPL_DT_HEADER_VERSION SPL_VERSION(0, 2)
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#define SPL_DRAM_HEADER_VERSION SPL_VERSION(0, 3)
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#define SPL_ADDR CONFIG_SUNXI_SRAM_ADDRESS
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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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#define SUNXI_BOOTED_FROM_MMC0_HIGH 0x10
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#define SUNXI_BOOTED_FROM_MMC2_HIGH 0x12
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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; /* since v0.1, set by sunxi-fel */
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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; /* since v0.1, set by sunxi-fel */
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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; /* since v0.2, set by mksunxiboot */
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uint32_t dram_size; /* in MiB, since v0.3, set by SPL */
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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]; /* since v0.2, filled by mksunxiboot */
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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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