Add a paragraph to explain how to get the address of the goldfish tty and use it as the debug uart. I think the address is actually fixed right now but it might change in the future.
Signed-off-by: Daniel Palmer <[email protected]> --- doc/board/emulation/qemu-m68k.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/doc/board/emulation/qemu-m68k.rst b/doc/board/emulation/qemu-m68k.rst index 6c4de54cf6a8..2f2e6bd6444a 100644 --- a/doc/board/emulation/qemu-m68k.rst +++ b/doc/board/emulation/qemu-m68k.rst @@ -31,6 +31,16 @@ The minimal QEMU command line to get U-Boot up and running is: Note that the `-nographic` option is used to redirect the console to stdio, which connects to the emulated Goldfish TTY device. +Debugging U-Boot +---------------- + +If you need early debugging output enable `CONFIG_DEBUG_UART_GOLDFISH`. +The base address for the UART can be found by activating the QEMU monitor, +running `info qtree`, and then looking for the goldfish tty device and +taking the mmio address. + +Baud rate doesn't matter. + Hardware Support ---------------- The following QEMU virt peripherals are supported in U-Boot: -- 2.51.0
