> > The next try was with more console_putchar calls added to the
> > gateA20() code. This narrowed it down to the loop waiting for an
> > empty keyboard controller input buffer.
>
> So how far did you get after that ?
Well, it doesn't hang any more after printing "Loading stage2 ....",
after I added some code [*] to grub's gateA20() function.
grub is now able to load and display the menu.lst file and the splashimage.
grub reports reasonable base and upper memory.
I can type exactly *one* character on the usb keyboard. When trying to
read a second character from the keyboard, the system hangs.
Or I can wait until the grub menu timeout expires. This starts loading the
default entry. multiboot and the boot_archive is loaded. Text screen is
cleared, ...., and the system hangs - before printing the
"SunOS Release 5.xx" copyright string.
[*]
diff -rub ../opensolaris-20060404/usr/src/grub/grub-0.95/stage2/asm.S
usr/src/grub/grub-0.95/stage2/asm.S
--- ../opensolaris-20060404/usr/src/grub/grub-0.95/stage2/asm.S 2006-04-05
23:28:21.000000000 +0200
+++ usr/src/grub/grub-0.95/stage2/asm.S 2006-04-10 18:11:44.152925307 +0200
@@ -1787,7 +1787,30 @@
jnz 3f
ret
-3: /* use keyboard controller */
+3: /*
+ * try to switch gateA20 using PORT92, the "Fast A20 and Init"
+ * register
+ */
+ mov $0x92, %dx
+ inb %dx, %al
+ /* skip the port92 code if it's unimplemented (read returns 0xff) */
+ cmpb $0xff, %al
+ jz 6f
+
+ /* set or clear bit1, the ALT_A20_GATE bit */
+ movb 4(%esp), %ah
+ testb %ah, %ah
+ jz 4f
+ orb $2, %al
+ jmp 5f
+4: and $0xfd, %al
+
+ /* clear the INIT_NOW bit; don't accidently reset the machine */
+5: and $0xfe, %al
+ outb %al, %dx
+
+
+6: /* use keyboard controller */
pushl %eax
call gloop1
@@ -1797,9 +1820,12 @@
gloopint1:
inb $K_STATUS
+ cmpb $0xff, %al
+ jz gloopint1_done
andb $K_IBUF_FUL, %al
jnz gloopint1
+gloopint1_done:
movb $KB_OUTPUT_MASK, %al
cmpb $0, 0x8(%esp)
jz gdoit
@@ -1820,6 +1846,8 @@
gloop1:
inb $K_STATUS
+ cmpb $0xff, %al
+ jz gloop2ret
andb $K_IBUF_FUL, %al
jnz gloop1
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