[POWERPC] Efika: Really, don't pretend to be CHRP

Fedora 9 works on Efika without the separate 'device-tree supplement',
thanks to the kernel's own fixups. With one exception -- because 'CHRP'
still appears on the 'machine:' line in /proc/cpuinfo, the installer
misdetects the platform and misconfigures yaboot, putting it into a PReP
boot partition instead of in the /boot filesystem where the Efika's
firmware could find it.

The kernel's fixups for Efika already correct one instance of 'chrp', in
the 'device_type' property. This fixes it in the 'CODEGEN,description'
property too, since that's what's exposed to userspace in /proc/cpuinfo.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/prom_init.c

@@ -2240,6 +2240,14 @@ static void __init fixup_device_tree_efika(void)
 	if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
 		prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
 
+	/* CODEGEN,description is exposed in /proc/cpuinfo so
+	   fix that too */
+	rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
+	if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
+		prom_setprop(node, "/", "CODEGEN,description",
+			     "Efika 5200B PowerPC System",
+			     sizeof("Efika 5200B PowerPC System"));
+
 	/* Fixup bestcomm interrupts property */
 	node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
 	if (PHANDLE_VALID(node)) {