Here are the next set of patches from my ongoing work to allow the q800 machine to boot MacOS related to SCSI devices.
The first patch implements a dummy FORMAT UNIT command which is used by the Apple HD SC Setup program when preparing an empty disk to install MacOS. Patch 2 adds a new quirks bitmap to SCSIDiskState to allow buggy and/or legacy features to enabled on an individual device basis. Once the quirks bitmap has been added, patch 3 uses the quirks feature to implement an Apple-specific mode page which is required to allow the disk to be recognised and used by Apple HD SC Setup. Patch 4 adds compat_props to the q800 machine which enable the new MODE_PAGE_APPLE_VENDOR quirk for all scsi-hd devices attached to the machine. Patch 5 adds a new quirk to force SCSI CDROMs to always return the block descriptor for a MODE SENSE command which is expected by A/UX, whilst patch 6 enables the quirk for all scsi-cd devices on the q800 machine. Patch 7 adds support for truncated MODE SELECT requests which are sent by A/UX (and also MacOS in some circumstances) when enumerating a SCSI CDROM device which are shown to be accepted on real hardware as documented in [1]. Patch 8 allows the MODE_PAGE_R_W_ERROR AWRE bit to be changeable since the A/UX MODE SELECT request sets this bit to 0 rather than the QEMU default which is 1. Patch 9 adds support for setting the CDROM block size via a MODE SELECT request which is supported by older CDROMs to allow the block size to be changed from the default of 2048 bytes to 512 bytes for compatibility purposes. This is used by A/UX which otherwise fails with SCSI errors if the block size is not set to 512 bytes when accessing CDROMs. Finally patches 10 and 11 augment the compat_props to set the default vendor, product and version information for all scsi-hd and scsi-cd devices attached to the q800 machine, taken from real drives. This is because MacOS will only allow a known set of SCSI devices to be recognised during the installation process. Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk> [1] https://68kmla.org/bb/index.php?threads/scsi2sd-project-anyone-interested.29040/page-7#post-316444 v2: - Change patchset title from "scsi: add support for FORMAT UNIT command and quirks" to "scsi: add quirks and features to support m68k Macs" - Fix missing shift in patch 2 as pointed out by Fam - Rename MODE_PAGE_APPLE to MODE_PAGE_APPLE_VENDOR - Add SCSI_DISK_QUIRK_MODE_SENSE_ROM_FORCE_DBD quirk - Add support for truncated MODE SELECT requests - Allow MODE_PAGE_R_W_ERROR AWRE bit to be changeable for CDROM devices - Allow the MODE SELECT block descriptor to set the CDROM block size Mark Cave-Ayland (11): scsi-disk: add FORMAT UNIT command scsi-disk: add new quirks bitmap to SCSIDiskState scsi-disk: add MODE_PAGE_APPLE_VENDOR quirk for Macintosh q800: implement compat_props to enable quirk_mode_page_apple_vendor for scsi-hd devices scsi-disk: add SCSI_DISK_QUIRK_MODE_SENSE_ROM_FORCE_DBD quirk for Macintosh q800: implement compat_props to enable quirk_mode_sense_rom_force_dbd for scsi-cd devices scsi-disk: allow truncated MODE SELECT requests scsi-disk: allow the MODE_PAGE_R_W_ERROR AWRE bit to be changeable for CDROM drives scsi-disk: allow MODE SELECT block descriptor to set the ROM device block size q800: add default vendor and product information for scsi-hd devices q800: add default vendor and product information for scsi-cd devices hw/m68k/q800.c | 13 ++++++++++ hw/scsi/scsi-disk.c | 53 +++++++++++++++++++++++++++++++++++----- hw/scsi/trace-events | 3 +++ include/hw/scsi/scsi.h | 4 +++ include/scsi/constants.h | 1 + 5 files changed, 68 insertions(+), 6 deletions(-) -- 2.20.1