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https://github.com/brain-hackers/u-boot-brain
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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>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Configuration for Amlogic Meson 64bits SoCs
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* (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
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*/
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#ifndef __MESON64_CONFIG_H
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#define __MESON64_CONFIG_H
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/* Generic Interrupt Controller Definitions */
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#if defined(CONFIG_MESON_AXG)
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#define GICD_BASE 0xffc01000
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#define GICC_BASE 0xffc02000
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#else /* MESON GXL and GXBB */
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#define GICD_BASE 0xc4301000
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#define GICC_BASE 0xc4302000
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#endif
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#define CONFIG_CPU_ARMV8
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#define CONFIG_REMAKE_ELF
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#define CONFIG_ENV_SIZE 0x2000
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#define CONFIG_SYS_MAXARGS 32
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#define CONFIG_SYS_MALLOC_LEN (32 << 20)
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#define CONFIG_SYS_CBSIZE 1024
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#define CONFIG_SYS_SDRAM_BASE 0
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#define CONFIG_SYS_INIT_SP_ADDR 0x20000000
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#define CONFIG_SYS_LOAD_ADDR CONFIG_SYS_TEXT_BASE
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#define CONFIG_SYS_BOOTM_LEN (64 << 20) /* 64 MiB */
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/* ROM USB boot support, auto-execute boot.scr at scriptaddr */
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#define BOOTENV_DEV_ROMUSB(devtypeu, devtypel, instance) \
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"bootcmd_romusb=" \
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"if test \"${boot_source}\" = \"usb\" && " \
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"test -n \"${scriptaddr}\"; then " \
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"echo '(ROM USB boot)'; " \
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"source ${scriptaddr}; " \
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"fi\0"
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#define BOOTENV_DEV_NAME_ROMUSB(devtypeu, devtypel, instance) \
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"romusb "
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#ifdef CONFIG_CMD_USB
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#define BOOT_TARGET_DEVICES_USB(func) func(USB, usb, 0)
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#else
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#define BOOT_TARGET_DEVICES_USB(func)
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#endif
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#ifndef BOOT_TARGET_DEVICES
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#define BOOT_TARGET_DEVICES(func) \
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func(ROMUSB, romusb, na) \
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func(MMC, mmc, 0) \
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func(MMC, mmc, 1) \
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func(MMC, mmc, 2) \
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BOOT_TARGET_DEVICES_USB(func) \
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func(PXE, pxe, na) \
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func(DHCP, dhcp, na)
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#endif
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#ifndef CONFIG_EXTRA_ENV_SETTINGS
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#define CONFIG_EXTRA_ENV_SETTINGS \
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"fdt_addr_r=0x08008000\0" \
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"scriptaddr=0x08000000\0" \
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"kernel_addr_r=0x08080000\0" \
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"pxefile_addr_r=0x01080000\0" \
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"ramdisk_addr_r=0x13000000\0" \
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"fdtfile=amlogic/" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0" \
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BOOTENV
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#endif
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#include <config_distro_bootcmd.h>
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#endif /* __MESON64_CONFIG_H */
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