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hw/char/escc: Implement loopback mode 

The firmware of the m68k next-cube machine uses the loopback mode
for self-testing the hardware and currently fails during this step.
By implementing the loopback mode, we can make the firmware pass
to the next step.

Signed-off-by: Thomas Huth <huth@tuxfamily.org>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230716153519.31722-1-huth@tuxfamily.org>
This commit is contained in:
Thomas Huth 2023-07-16 17:35:19 +02:00 committed by Philippe Mathieu-Daudé
parent 5fc1a68660
commit 02388b5925
1 changed files with 3 additions and 1 deletions
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4
hw/char/escc.c
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@ -653,7 +653,9 @@ static void escc_mem_write(void *opaque, hwaddr addr,
escc_update_irq(s);
s->tx = val;
if (s->wregs[W_TXCTRL2] & TXCTRL2_TXEN) { /* tx enabled */
if (qemu_chr_fe_backend_connected(&s->chr)) {
if (s->wregs[W_MISC2] & MISC2_LCL_LOOP) {
serial_receive_byte(s, s->tx);
} else if (qemu_chr_fe_backend_connected(&s->chr)) {
/*
* XXX this blocks entire thread. Rewrite to use
* qemu_chr_fe_write and background I/O callbacks