[PATCH 158] M68k 68060 errata I14

[PATCH 158] M68k 68060 errata I14

[Geert Uytterhoeven]

M68k: gcc lately manages to generate the code sequence described in the 060
errata I14, so use the described workaround (from Roman Zippel)

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

--- linux-2.4.27-rc3/arch/m68k/kernel/setup.c	2004-04-30 16:35:25.000000000 +0200
+++ linux-m68k-2.4.27-rc3/arch/m68k/kernel/setup.c	2004-07-04 21:55:44.000000000 +0200
@@ -249,6 +249,18 @@
 	else if (CPU_IS_060)
 		m68k_is040or060 = 6;
 
+	if (CPU_IS_060) {
+		u32 pcr;
+
+		asm (".chip 68060; movec %%pcr,%0; .chip 68k"
+		     : "=d" (pcr));
+		if (((pcr >> 8) & 0xff) <= 5) {
+			printk("Enabling workaround for errata I14\n");
+			asm (".chip 68060; movec %0,%%pcr; .chip 68k"
+			     : : "d" (pcr | 0x20));
+		}
+	}
+
 	/* FIXME: m68k_fputype is passed in by Penguin booter, which can
 	 * be confused by software FPU emulation. BEWARE.
 	 * We should really do our own FPU check at startup.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds