[PATCH 01/18] Virtex: Add uartlite bootwrapper driver

[Grant Likely]

On 9/28/07, Arnd Bergmann <arnd at arndb.de> wrote:
> On Friday 28 September 2007, Grant Likely wrote:
> > +static void uartlite_putc(unsigned char c)
> > +{
> > +while ((in_be32(reg_base + 0x8) & 0x08) != 0); /* spin */
> > +out_be32(reg_base + 0x4, c);
> > +}
>
> When coding a spin-loop, it's better to do a cpu_relax() between
> each attempt.

Is cpu_relax even implemented in the bootwrapper?

g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely at secretlab.ca
(403) 399-0195