Re: [parisc-linux] A500 status update

[Richard Hirst <rhirst@linuxcare.com>]

On Mon, Dec 11, 2000 at 04:37:16PM +0100, Jes Sorensen wrote:
> >>>>> "Grant" == Grant Grundler <grundler@cup.hp.com> writes:
> 
> Grant> o dd to
> Grant> raw disk isn't working right. "No space left on device".  See
> Grant> the output below.
> 
> Likely cause would be that the structs for stat don't match between
> the kernel and glibc. I still think the best approach would be to go
> for a clean 64 bit userland from the beginning as we have on the Alpha
> and ia64 and provide backwards compat support afterwards. I don't like
> to see the hppa64 port end up in the same situation as sparc64 where
> almost nothing gets done for years because there is already a 32 bit
> userland.

This 'no space' problem was caused by an error in the register save/
restore on interrupts, for 64 bit (assembly.h):

date: 2000/12/11 13:10:49;  author: rhirst;  state: Exp;  lines: +10 -0
cr11 (sar) is a funny one.  5 bits on PA1.1 and 6 bit on PA2.0.  For
PA2.0 mtsar or mtctl always write 6 bits, but mfctl only reads 5 bits.
Use mfctl,w to read all six bits.  Otherwise we loose the 6th bit on a
save/restore over interrupt.  Caused dd of=/dev/sdaX to report no space
available at random.

Richard