mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-06 03:06:16 +09:00
d96a782d09
The Amlogic Meson SoCs ROM supports a boot over USB with a custom protocol. When no other boot medium are available (or by forcing the USB mode), the ROM sets the primary USB port as device mode and waits for a Host to enumerate. When enumerated, a custom protocol described at [1] permits writing to memory and execute some specific FIP init code to run the loaded Arm Trusted Firmware BL2 and BL3 stages before running the BL33 stage. In this mode, we can load different binaries that can be used by U-boot like a script image file. This adds support for a custom USB boot stage only available when the boot mode is USB and the script file at a pre-defined address is valid. This support was heavily copied from the Sunxi Allwinner FEL U-Boot support. The tool pyamlboot described at [2], permits using this boot mode on boards exposing the first USB port, either as OTG or Host port. [1] https://github.com/superna9999/pyamlboot/blob/master/PROTOCOL.md [2] https://github.com/superna9999/pyamlboot/blob/master/README.md Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
118 lines
1.9 KiB
C
118 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
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*/
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#include <common.h>
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#include <asm/arch/boot.h>
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#include <linux/libfdt.h>
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#include <linux/err.h>
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#include <asm/arch/mem.h>
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#include <asm/arch/sm.h>
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#include <asm/armv8/mmu.h>
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#include <asm/unaligned.h>
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#include <efi_loader.h>
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DECLARE_GLOBAL_DATA_PTR;
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__weak int board_init(void)
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{
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return 0;
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}
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int dram_init(void)
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{
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const fdt64_t *val;
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int offset;
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int len;
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offset = fdt_path_offset(gd->fdt_blob, "/memory");
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if (offset < 0)
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return -EINVAL;
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val = fdt_getprop(gd->fdt_blob, offset, "reg", &len);
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if (len < sizeof(*val) * 2)
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return -EINVAL;
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/* Use unaligned access since cache is still disabled */
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gd->ram_size = get_unaligned_be64(&val[1]);
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return 0;
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}
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__weak int meson_ft_board_setup(void *blob, bd_t *bd)
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{
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return 0;
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}
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int ft_board_setup(void *blob, bd_t *bd)
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{
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meson_init_reserved_memory(blob);
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return meson_ft_board_setup(blob, bd);
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}
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void meson_board_add_reserved_memory(void *fdt, u64 start, u64 size)
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{
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int ret;
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ret = fdt_add_mem_rsv(fdt, start, size);
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if (ret)
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printf("Could not reserve zone @ 0x%llx\n", start);
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if (IS_ENABLED(CONFIG_EFI_LOADER)) {
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efi_add_memory_map(start,
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ALIGN(size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT,
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EFI_RESERVED_MEMORY_TYPE, false);
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}
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}
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static void meson_set_boot_source(void)
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{
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const char *source;
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switch (meson_get_boot_device()) {
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case BOOT_DEVICE_EMMC:
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source = "emmc";
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break;
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case BOOT_DEVICE_NAND:
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source = "nand";
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break;
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case BOOT_DEVICE_SPI:
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source = "spi";
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break;
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case BOOT_DEVICE_SD:
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source = "sd";
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break;
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case BOOT_DEVICE_USB:
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source = "usb";
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break;
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default:
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source = "unknown";
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}
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env_set("boot_source", source);
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}
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__weak int meson_board_late_init(void)
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{
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return 0;
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}
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int board_late_init(void)
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{
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meson_set_boot_source();
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return meson_board_late_init();
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}
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void reset_cpu(ulong addr)
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{
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psci_system_reset();
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}
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