[SeaBIOS] [PATCH 2/2] esp-scsi: check for INTR_BS/INTR_FC instead of STAT_TC for command completion

The ESP SELATN command used to send SCSI commands from the ESP to thes 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

[SeaBIOS] [PATCH 1/2] esp-scsi: flush FIFO before sending SCSI command

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 ---

[SeaBIOS] [PATCH 0/2] esp-scsi: fix reliance on QEMU ESP SCSI implementation bugs

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