Re: Q: how to send ATA cmds to USB drive?
- From: Herbert Rosmanith <kernel@xxxxxxxxxxxxxxxxx>
- Date: Mon, 12 Jun 2006 12:26:10 +0200 (MET DST)
int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
...
/*
* If SCSI-2 or lower, store the LUN value in cmnd.
*/
if (cmd->device->scsi_level <= SCSI_2) {
cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) |
(cmd->device->lun << 5 & 0xe0);
}
hm. now what .... ? If scsi-2 requires this, and the device is scsi-2.
actually, the scsi-level reported by the device is *not* 2.
it is set to 2 by "slave_configure" from drivers/usb/storage/scsiglue.c:
static int slave_configure(struct scsi_device *sdev)
{
...
/* Set the SCSI level to at least 2. We'll leave it at 3 if that's
* what is originally reported. We need this to avoid confusing
* the SCSI layer with devices that report 0 or 1, but need 10-byte
* commands (ala ATAPI devices behind certain bridges, or devices
^^^^^^^^^^^^^^^
the CY7C68310 is exactly that.
* which simply have broken INQUIRY data).
...
if (sdev->scsi_level < SCSI_2)
sdev->scsi_level = sdev->sdev_target->scsi_level = SCSI_2;
kind regards,
h.rosmanith
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- Re: Q: how to send ATA cmds to USB drive?
- From: Herbert Rosmanith
- Re: Q: how to send ATA cmds to USB drive?
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