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https://github.com/AsahiLinux/u-boot
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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> |
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| .. | ||
| board-axg.c | ||
| board-common.c | ||
| board-gx.c | ||
| Kconfig | ||
| Makefile | ||
| sm.c | ||