linux on vw540 with 1.0006 PROM

[Andy Isaacson <adisaacs@mr-happy.com>]

OK, I know this is probably an exercise in futility (given SGI's
apparent lack of interest in seeing Linux on these machines) but I'm
trying my darndest to get linux up on a couple of 540's.  I finally
did get the kernel loaded after working around a PROM bug that causes
arclx.exe to lock up on boot.

I've enclosed the patch below.  You can get a binary from
http://www.lcse.umn.edu/~adi/visws/

Also there are the kernel config files I used.  Apparently something
in 2.2.12 breaks on the visws, so I'm using
2.2.10+visws.2210.28jul99.patch .

The machine is up now, but it seems to have some "issues"; mostly I've
noticed problems with device drivers (loading floppy.o locked up the
machine once; mounting a CD-ROM locked it up for a good 5 seconds,
etc).  I haven't really pounded on the machine yet, though.

diff -ur arcboot-21jul99/arclib/arc.c arcboot-13jan2000/arclib/arc.c
--- arcboot-21jul99/arclib/arc.c        Thu Jul  8 06:18:37 1999
+++ arcboot-13jan2000/arclib/arc.c      Thu Jan 13 22:40:24 2000
@@ -177,11 +177,18 @@
     return FVector->Close(FileID);
 }
 
 LONG
 ArcRead(ULONG FileID, VOID *Buffer, ULONG N, ULONG *Count)
 {
-    return FVector->Read(FileID, Buffer, N, Count);
+    /* XXX adi on our 540's with firmware version 1.006, passing a NULL
+     * to Read blows up.  Thus this workaround.
+     */
+    LONG retval;
+    ULONG mycount;
+    retval = FVector->Read(FileID, Buffer, N, &mycount);
+    if(Count)
+       *Count = mycount;
+    return retval;
 }
 
 
diff -ur arcboot-21jul99/loadlx/arclx.c arcboot-13jan2000/loadlx/arclx.c
--- arcboot-21jul99/loadlx/arclx.c      Wed Jul 21 09:26:54 1999
+++ arcboot-13jan2000/loadlx/arclx.c    Thu Jan 13 20:45:15 2000
@@ -321,7 +322,7 @@
 _start(LONG argc, CHAR *argv[], CHAR *envp[])
 {
     /* Print identification */
-    printf(ANSI_CLEAR "\nARC Linux unified loader, 21jul99\n\n");
+    printf(ANSI_CLEAR "\nARC Linux unified loader, 13jan2000\n\n");
 
     InitMalloc();
 
diff -ur arcboot-21jul99/loadlx/io.c arcboot-13jan2000/loadlx/io.c
--- arcboot-21jul99/loadlx/io.c Wed Jul 21 09:47:53 1999
+++ arcboot-13jan2000/loadlx/io.c       Thu Jan 13 21:26:03 2000
@@ -289,6 +289,8 @@
        LONG status;
        ULONG nb = strlen(partition) + strlen(filename);
        CHAR *path = (CHAR *)malloc(nb);
+
+       printf("arc_file_open\n");
        if (path == NULL) {
                Fatal("Malloc of %d for %s and %s failed\n",
                                                nb, partition, filename);
@@ -318,6 +320,7 @@
        if (status != ESUCCESS) {
                Fatal("Read of 0x%x bytes at 0x%x failed\n", nb, off);
        }
+       printf("ARC read finished\n");
 }
 
 
@@ -329,10 +332,13 @@
     ino_t file_inode;
     errcode_t status;
 
+    printf("file_open: %s %s\n", partition, filename);
     initialize_ext2_error_table();
 
+    printf("calling ext2open...\n");
     status = ext2fs_open(partition, 0, 0, 0, arc_io_manager, &fs);
     if (status != 0) {
+       printf("ext2open failed, trying arc_file_open\n");
         /* Maybe ARC can read it directly (FAT floppy, etc) */
         return arc_file_open(partition, filename);
     }

-- 
Andy Isaacson  http://web.mr-happy.com/~adisaacs/   Fight Spam, join CAUCE:
adi@acm.org adisaacs@mr-happy.com isaacson@cs.umn.edu   www.cauce.org