Re: 2.3.46 Boot Failure

[Richard Henderson]

On Sat, Feb 19, 2000 at 12:49:30PM +0100, Gerard Roudier wrote:
> It is fine to be impatient. I have been impatient for about 6 months about
> a fix for the alpha __delay()/__udelay() stuff that can be 200% wrong due
> to inlining and that notably breaks the SCSI clock speed measurement by
> ncr/sym53c8xx at initialisation. This stuff does not seem to have been
> fixed in all still alive linux branches (I mean 2.0/2.2/2.3). 

No, it has in fact been fixed.

                ".align 4\n"
                "1:     subq %0,1,%0\n"
                "       bge %0,1b\n"
                "       nop"

That last nop is magic.  The type of instruction that follows the
branch affects slotting on ev6, which affects the speed of the loop.

r~