[LinuxBIOS] epia patch

[Ben Hewson]

Here is a patch to hopefully fix the random hangs that occur with the
EPIA board.

There is a comment that says

// Set bit 6 of 0x40, because Award does it (IO recovery time)
    // IMPORTANT FIX - EISA 0x4d0 decoding must be on so that PCI
    // interrupts can be properly marked as level triggered.

however somewhere in the translation from V1 to V2  it appears the
relevant bit
of code was removed or deleted.

Signed-off-by: Ben Hewson

-------------------------------------------------------------------------------------------------------------

I can't say for sure this has fixed the issue. should I get any more
hangs though I will post a note.
I have a feeling though this may be the cause as hangs seem to mostly
occur during heavy IO port access.
Mostly in the SMBus routines where inb() is used for a delay.

Ben

and I forgot the patch again

Index: src/southbridge/via/vt8231/vt8231_lpc.c
===================================================================
--- src/southbridge/via/vt8231/vt8231_lpc.c	(revision 2710)
+++ src/southbridge/via/vt8231/vt8231_lpc.c	(working copy)
@@ -72,6 +72,7 @@
    // IMPORTANT FIX - EISA 0x4d0 decoding must be on so that PCI 
    // interrupts can be properly marked as level triggered.
    enables = pci_read_config8(dev, 0x40);
+	enables |= 0x44;
    pci_write_config8(dev, 0x40, enables);
    
    // Set 0x42 to 0xf0 to match Award bios

[Peter Stuge]

On Mon, Jun 04, 2007 at 07:51:19PM +0100, Ben Hewson wrote:
> I can't say for sure this has fixed the issue. should I get any
> more hangs though I will post a note.

Give it a few days, if no hang let's commit.

//Peter

[Alex Mauer]

Peter Stuge wrote:
> On Mon, Jun 04, 2007 at 07:51:19PM +0100, Ben Hewson wrote:
> > I can't say for sure this has fixed the issue. should I get any
> > more hangs though I will post a note.
>
> Give it a few days, if no hang let's commit.

For me this patch is a big improvement, but does not remove hangs
entirely.  Note that these hangs are only during the very early boot
process (RAM detection) and not at later runtime.

-Alex Mauer "hawke"