Re: interesting things with PC164 and latest milo-980602

["Alexander V. Lukyanov" <lav yars free net>]

On Sun, Sep 06, 1998 at 11:33:01PM +0200, Quant-X Alpha Linux Support wrote:
> Hi Alexander !
> 
> > compiler, kernel and some apps going to older milos is impossible on pc164.
> > 
> > The hang happens just after the line 
> > 	SMC FDC37C93X Ultra I/O Controller found @ 0x370
> 
> > Suspiciously looks like a hang I experienced a while ago with older kernels.
> > At that time the hang magically disappeared when I inserted a delay in a 
> > function for the smc fdc init. Have not tried that now yet.
> 
> Same here on our 1GB Ram LX. It hangs most of the time there, 
> sometimes a line earlier (PCI message).
> I must boot up to nine times to avoid this. :-(
> This timing problem happens also when using 2.0.33...
> 
> > At that time the hang magically disappeared when I inserted a delay in a 
> > function for the smc fdc init. Have not tried that now yet.
> 
> Cool. Please post your delay-patch here...

Ok, here is it. Just verified and it cures the hang I experienced with 2.1.119
and egcs-1.1/ev56. Looks like the hang happens when egcs produces too fast
code :) since the last time I noticed the hang I used egcs snapshot which
made dhrystone fater than egcs-1.1/ev5. dhrystone with egcs-1.1/ev56 is almost
as fast.

I don't know why the hang happens, but it seems to be hardware related.
Maybe some hardware doesn't like too fast accesses.

--- smc37c93x.c.~1~	Tue Apr  7 14:45:04 1998
+++ smc37c93x.c	Mon Sep  7 14:19:06 1998
@@ -12,6 +12,7 @@
 #include <asm/hwrpb.h>
 #include <asm/io.h>
 #include <asm/segment.h>
+#include <asm/delay.h>
 
 #if 0
 # define DBG_DEVS(args)         printk args
@@ -233,6 +234,8 @@
 int __init SMC93x_Init(void)
 {
 	unsigned long SMCUltraBase;
+
+	udelay(500);
 
 	if ((SMCUltraBase = SMCDetectUltraIO()) != 0UL) {
 		printk("SMC FDC37C93X Ultra I/O Controller found @ 0x%lx\n",

   Alexander.