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Some platforms (such as the Sipeed Lichee Pi 4A) do not provide a functional SBI debug console. We can obtain early debug messages on these systems by writing directly to the UART used by the vendor firmware. There is no viable way to parse the UART address from the device tree, since the prefix debug messages occur extremely early, before the C runtime environment is available and therefore before any information has been parsed from the device tree. The early UART model and register addresses must be configured by editing config/serial.h if needed. (This is an acceptable limitation, since prefix debugging is an extremely specialised use case.) Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org