On Fri, 28 Sep 2007 14:04:04 -0600
"Grant Likely" [off-list ref] wrote:

On 9/28/07, Arnd Bergmann [off-list ref] wrote:

quoted

On Friday 28 September 2007, Grant Likely wrote:

quoted

+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?

No.  And it doesn't need to be :)

josh