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List:       linux-kernel
Subject:    2.2.0-pre1 breaks ppa-driver
From:       Gert Vervoort <gert.vervoort () wxs ! nl>
Date:       1998-12-31 21:12:57
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The assembler changes in ppa.c in linux-2.2.0-pre1 
break detections of a PS/2 parallel port.
Both gcc 2.7.2.3 and egcs 1.1.1 give the same result.

>From dmesg:
--------------------------------------------------------------
ppa: Version 2.01
ppa: Found device at ID 6, Attempting to use EPP 32 bit
ppa: Found device at ID 6, Attempting to use PS/2
ppa: Unable to establish communication, aborting driver load.
scsi : 0 hosts.
scsi : detected total.
--------------------------------------------------------------

Workaround:
(disables assembler routines for i386 in ppa.c)

--- linux/drivers/scsi/ppa.c.ORIG	Thu Dec 31 15:43:50 1998
+++ linux/drivers/scsi/ppa.c	Thu Dec 31 15:46:46 1998
@@ -366,7 +366,7 @@
  * be very little improvement on the current 586+ machines as it is the
  * IO statements which will limit throughput.
  */
-#ifdef __i386__ 
+#ifdef 0
 #define BYTE_OUT(reg) \
 	"	movb " #reg ",%%al\n" \
 	"	outb %%al,(%%dx)\n" \


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