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Very occasionally, the MMU is enabled before the 'ldr' which loads 

the mapped address to leap to completes. This generally manifests
itself as a random exception with RedBoot just after 'go'.

Fix it by adding a data-dependency on the 'ldr' result.
This commit is contained in:
scw 2004-02-12 23:26:48 +00:00
parent e38f9bc603
commit 7096f676a7
1 changed files with 4 additions and 3 deletions
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7
sys/arch/evbarm/ixdp425/ixdp425_start.S
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@ -1,4 +1,4 @@
/* $NetBSD: ixdp425_start.S,v 1.3 2003/12/08 16:15:31 scw Exp $ */
/* $NetBSD: ixdp425_start.S,v 1.4 2004/02/12 23:26:48 scw Exp $ */
/*
* Copyright (c) 2003
@ -151,7 +151,8 @@ Lunmapped:
mcr p15, 0, r0, c3, c0, 0
/* Get ready to jump to the "real" kernel entry point... */
ldr r0, Lstart
ldr r1, Lstart
mov r1, r1 /* Make sure the load completes! */
/* OK, let's enable the MMU. */
mrc p15, 0, r2, c1, c0, 0
@ -166,7 +167,7 @@ Lunmapped:
/* CPWAIT sequence to make sure the MMU is on... */
mrc p15, 0, r2, c2, c0, 0 /* arbitrary read of CP15 */
mov r2, r2 /* force it to complete */
mov pc, r0 /* leap to kernel entry point! */
mov pc, r1 /* leap to kernel entry point! */
Ltable:
.word 0x10200000 - 0x4000