Hello Seabios maintainers,
I was wondering, is there any chance of getting a new release tag
(e.g. rel-1.16.3) anytime soon?
Or is there any plan on when it will be tagged?
I'm waiting to send out a (AHCI specific) QEMU patch, but I can't
do so until:
1) there is a new Seabios tag
2) QEMU has
The existing esp-scsi state machine checks for the STAT_TC bit to exit state 1
but in the case where there is no data phase, a non-DMA command is executed
which doesn't set STAT_TC. This only works because QEMU currently always sets
STAT_TC just after issuing every SCSI command.
Update the
The ESP SELATN command used to send SCSI commands from the ESP to the SCSI bus
is not a DMA command and therefore does not affect the STAT_TC bit. The only
reason this works at all is due to a bug in QEMU which (currently) always
updates the STAT_TC bit in ESP_RSTAT regardless of the state of the
The ESP FIFO is used as a buffer for DMA requests and so isn't guaranteed to
be empty in the case of SCSI errors or a mixed DMA/non-DMA request. Flush the
FIFO before sending a SCSI command to guarantee that it is correctly
positioned at the start of the FIFO.
Signed-off-by: Mark Cave-Ayland
Whilst trying to improve QEMU's ESP SCSI implementation with regard to the
NCR datasheet, I noticed that SeaBIOS would fail to boot one of my Debian
test images with my patches applied.
Further investigation revealed that the SeaBIOS esp-scsi driver inadvertently
relies on existing bugs in QEMU's
On 02/08/2023 10:48, Mark Cave-Ayland wrote:
Whilst trying to improve QEMU's ESP SCSI implementation with regard to the
NCR datasheet, I noticed that SeaBIOS would fail to boot one of my Debian
test images with my patches applied.
Further investigation revealed that the SeaBIOS esp-scsi driver
