Hi,

I've finally managed to boot my brand new net4501 box from the (poor) CF
card I bought.

First I had some geometry issues, but those were easy to solve.

Then I was hit by the issue (often described in soekris-tech apparently)
of the impossibility of reading more than one sector at a time through INT
13h on the CF card. Thus I had to patch the bootblocks code a little.

My assembly is rather poor but it seems to do the job, so I leave it here
in case someone would need it. Maybe David Laight can work out a
compile-time option for a similar code.

Index: bootxx/pbr.S
===================================================================
RCS file: /cvsroot/src/sys/arch/i386/stand/bootxx/pbr.S,v
retrieving revision 1.3
diff -u -r1.3 pbr.S
--- bootxx/pbr.S	2003/05/15 08:50:53	1.3
+++ bootxx/pbr.S	2003/07/25 04:13:08
@@ -283,9 +283,18 @@
 
 chs_read:
 	movw	$BOOTADDR, %bx			/* es:bx is buffer */
-	movw	$0x200 + BOOTXX_SECTORS, %ax	/* command 2, xx sectors */
+	push	%di
+	movw	$BOOTXX_SECTORS, %di
+read_loop:
+	movw	$0x201, %ax	/* command 2, sectors one by one */
 	int	$0x13
 	jc	read_err
+	addw	$512,%bx
+	inc	%cl
+	dec	%di
+	jne	read_loop
+	movw	$BOOTADDR, %bx			/* bis repetita */
+	pop	%di
 	ret
 
 
Index: lib/bios_disk.S
===================================================================
RCS file: /cvsroot/src/sys/arch/i386/stand/lib/bios_disk.S,v
retrieving revision 1.13
diff -u -r1.13 bios_disk.S
--- lib/bios_disk.S	2003/04/16 12:45:10	1.13
+++ lib/bios_disk.S	2003/07/25 04:13:09
@@ -139,8 +139,18 @@
 	pop	%bx
 	and	$0xf, %bx	# and min offset - to avoid overrun
 
-	movb	$0x2, %ah	# subfunction
+read_loop:
+	pushw	%ax
+	movw	$0x201, %ax	# subfunction
 	int	$0x13
+	jc	read_error
+	popw	%ax
+	inc	%cl
+	addw	$512,%bx
+	dec	%al
+	jne	read_loop
+
+read_error:
 	setc	%al		# error code is in %ah
 	
 	calll	_C_LABEL(real_to_prot) # back to protected mode


-- 
Quentin Garnier - cube@cubidou.net
"Feels like I'm fiddling while Rome is burning down.
Should I lay my fiddle down and take a rifle from the ground ?"
Leigh Nash/Sixpence None The Richer, Paralyzed, Divine Discontents, 2002.