On Thu, 18 Nov 2021 at 18:18, Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk> wrote: > > This is another attempt to fix booting 32-bit QEMU SPARC machines in > qemu-system-sparc using a real Sun PROM based upon further experiments and > re-reading of the ESCC datasheet from a previous patch posted at > https://lists.gnu.org/archive/html/qemu-devel/2021-11/msg00324.html. > > It appears that both the Sun PROM and OpenBSD with OpenBIOS fail to send an > explicit reset command as recommended in the ESCC datasheet, which causes > hangs during serial port enumeration since the introduction of the recent > ESCC reset changes. > > The first patch always sets STATUS_TXEMPTY in R_STATUS on hardware reset > which wasn't documented in the "Reset" section(s) but is documented in the > "Transmit Interrupts and Transmit Buffer Empty Bit" section, whilst the > second patch updates SPEC_ALLSENT when writing to W_TXCTRL1. > > Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>
Series Reviewed-by: Peter Maydell <peter.mayd...@linaro.org> thanks -- PMM
