(POSSIBLY 1522 specific) -ERY

yesterday, I got my brand-new CD-ROM drive:
<6>  Vendor: TOSHIBA   Model: CD-ROM XM-4101TA  Rev: 2483
<6>  Type:   CD-ROM                             ANSI SCSI revision: 02

I got a "unsupported sectorsize" message on the first boot attempt.

I figured out that the device doesn't respond correctly to the
first couple of READ CDROM CAPACITY commands. I don't know why, but it
succeeds on later tries...  Anyhow, on the first attempts it get's the
command, but skips the information transfer phase by just sending an
ok status and a COMMAND COMPLETE message.  I patched sr.c to handle this:


--- sr.c.org	Fri Dec  3 14:27:41 1993
+++ sr.c	Fri Dec  3 14:31:04 1993
@@ -656,6 +656,7 @@
     cmd[0] = READ_CAPACITY;
     cmd[1] = (scsi_CDs[i].device->lun << 5) & 0xe0;
     memset ((void *) &cmd[2], 0, 8);
+    memset ((void *) buffer, 0, 4);
     SCpnt->request.dev = 0xffff;  /* Mark as really busy */
     
     scsi_do_cmd (SCpnt,
@@ -681,13 +682,14 @@
   
   wake_up(&scsi_devices[SCpnt->index].device_wait); 
 
-  if (the_result) {
+  scsi_CDs[i].capacity = (buffer[0] << 24) |
+    (buffer[1] << 16) | (buffer[2] << 8) | buffer[3];
+
+  if (the_result || scsi_CDs[i].capacity==0) {
     scsi_CDs[i].capacity = 0x1fffff;
     scsi_CDs[i].sector_size = 2048;  /* A guess, just in case */
     scsi_CDs[i].needs_sector_size = 1;
   } else {
-    scsi_CDs[i].capacity = (buffer[0] << 24) |
-      (buffer[1] << 16) | (buffer[2] << 8) | buffer[3];
     scsi_CDs[i].sector_size = (buffer[4] << 24) |
       (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
     if(scsi_CDs[i].sector_size == 0) scsi_CDs[i].sector_size = 2048;