Xen full virtualization does not handle unaligned IO with page crossing.
Disable 32-bit PIO as a workaround.
Signed-off-by: Asit Mallick <asit.k.mallick@xxxxxxxxx>
Signed-off-by: Arun Sharma <arun.sharma@xxxxxxxxx>
diff -r c9f0c3619b96 -r ae5dbce3f530 tools/firmware/rombios/rombios.c
--- a/tools/firmware/rombios/rombios.c Tue Jul 12 23:37:57 2005
+++ b/tools/firmware/rombios/rombios.c Wed Jul 13 19:12:38 2005
@@ -28,6 +28,11 @@
#define VMXASSIST
#undef VMXTEST
+
+// Xen full virtualization does not handle unaligned IO with page crossing.
+// Disable 32-bit PIO as a workaround.
+#define NO_PIO32
+
// ROM BIOS compatability entry points:
// ===================================
@@ -2248,6 +2253,9 @@
Bit16u cylinders, heads, spt, blksize;
Bit8u translation, removable, mode;
+ // default mode to PIO16
+ mode = ATA_MODE_PIO16;
+
//Temporary values to do the transfer
write_byte(ebda_seg,&EbdaData->ata.devices[device].device,ATA_DEVICE_HD);
write_byte(ebda_seg,&EbdaData->ata.devices[device].mode, ATA_MODE_PIO16);
@@ -2256,7 +2264,10 @@
BX_PANIC("ata-detect: Failed to detect ATA device\n");
removable = (read_byte(get_SS(),buffer+0) & 0x80) ? 1 : 0;
+#ifndef NO_PIO32
mode = read_byte(get_SS(),buffer+96) ? ATA_MODE_PIO32 :
ATA_MODE_PIO16;
+#endif
+
blksize = read_word(get_SS(),buffer+10);
cylinders = read_word(get_SS(),buffer+(1*2)); // word 1
@@ -2346,6 +2357,9 @@
Bit8u type, removable, mode;
Bit16u blksize;
+ // default mode to PIO16
+ mode = ATA_MODE_PIO16;
+
//Temporary values to do the transfer
write_byte(ebda_seg,&EbdaData->ata.devices[device].device,ATA_DEVICE_CDROM);
write_byte(ebda_seg,&EbdaData->ata.devices[device].mode, ATA_MODE_PIO16);
@@ -2355,7 +2369,9 @@
type = read_byte(get_SS(),buffer+1) & 0x1f;
removable = (read_byte(get_SS(),buffer+0) & 0x80) ? 1 : 0;
+#ifndef NO_PIO32
mode = read_byte(get_SS(),buffer+96) ? ATA_MODE_PIO32 :
ATA_MODE_PIO16;
+#endif
blksize = 2048;
write_byte(ebda_seg,&EbdaData->ata.devices[device].device, type);
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