imx: fix exception vectors relocation in imx27
Commit 3ff46cc4 fixed exception vectors setting in
the general ARM case, by either copying the exception
and indirect vector tables to normal (0x00000000) or
high (0xFFFF0000) vectors address, or setting VBAR to
U-Boot's base if applicable.
i.MX27 SoC is ARM926E-JS, thus has only normal and
high options, but does not provide RAM at 0xFFFF0000
and has only ROM at 0x00000000; it is therefore not
possible to move or change its exception vectors.
Besides, i.MX27 ROM code does provide an indirect
vectors table but at a non-standard address and with
the reset and reserved vectors missing.
Turn the current vector relocation code into a weak
routine called after relocate_code from crt0, and add
strong version for i.MX27.
Series-Cc: Heiko Schocher <hs@denx.de>
Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
Reviewed-by: Stefano Babic <sbabic@denx.de>
Tested-by: Stefano Babic <sbabic@denx.de>
Tested-by: Philippe Reynes <tremyfr@gmail.com>
Tested-by: Philippe Reynes <tremyfr@yahoo.fr>
diff --git a/arch/arm/lib/relocate.S b/arch/arm/lib/relocate.S
index 6ede41c..92f5314 100644
--- a/arch/arm/lib/relocate.S
+++ b/arch/arm/lib/relocate.S
@@ -11,6 +11,47 @@
#include <linux/linkage.h>
/*
+ * Default/weak exception vectors relocation routine
+ *
+ * This routine covers the standard ARM cases: normal (0x00000000),
+ * high (0xffff0000) and VBAR. SoCs which do not comply with any of
+ * the standard cases must provide their own, strong, version.
+ */
+
+ .section .text.relocate_vectors,"ax",%progbits
+ .weak relocate_vectors
+
+ENTRY(relocate_vectors)
+
+#ifdef CONFIG_HAS_VBAR
+ /*
+ * If the ARM processor has the security extensions,
+ * use VBAR to relocate the exception vectors.
+ */
+ ldr r0, [r9, #GD_RELOCADDR] /* r0 = gd->relocaddr */
+ mcr p15, 0, r0, c12, c0, 0 /* Set VBAR */
+#else
+ /*
+ * Copy the relocated exception vectors to the
+ * correct address
+ * CP15 c1 V bit gives us the location of the vectors:
+ * 0x00000000 or 0xFFFF0000.
+ */
+ ldr r0, [r9, #GD_RELOCADDR] /* r0 = gd->relocaddr */
+ mrc p15, 0, r2, c1, c0, 0 /* V bit (bit[13]) in CP15 c1 */
+ ands r2, r2, #(1 << 13)
+ ldreq r1, =0x00000000 /* If V=0 */
+ ldrne r1, =0xFFFF0000 /* If V=1 */
+ ldmia r0!, {r2-r8,r10}
+ stmia r1!, {r2-r8,r10}
+ ldmia r0!, {r2-r8,r10}
+ stmia r1!, {r2-r8,r10}
+#endif
+ bx lr
+
+ENDPROC(relocate_vectors)
+
+/*
* void relocate_code(addr_moni)
*
* This function relocates the monitor code.
@@ -54,34 +95,6 @@
cmp r2, r3
blo fixloop
- /*
- * Relocate the exception vectors
- */
-#ifdef CONFIG_HAS_VBAR
- /*
- * If the ARM processor has the security extensions,
- * use VBAR to relocate the exception vectors.
- */
- ldr r0, [r9, #GD_RELOCADDR] /* r0 = gd->relocaddr */
- mcr p15, 0, r0, c12, c0, 0 /* Set VBAR */
-#else
- /*
- * Copy the relocated exception vectors to the
- * correct address
- * CP15 c1 V bit gives us the location of the vectors:
- * 0x00000000 or 0xFFFF0000.
- */
- ldr r0, [r9, #GD_RELOCADDR] /* r0 = gd->relocaddr */
- mrc p15, 0, r2, c1, c0, 0 /* V bit (bit[13]) in CP15 c1 */
- ands r2, r2, #(1 << 13)
- ldreq r1, =0x00000000 /* If V=0 */
- ldrne r1, =0xFFFF0000 /* If V=1 */
- ldmia r0!, {r2-r8,r10}
- stmia r1!, {r2-r8,r10}
- ldmia r0!, {r2-r8,r10}
- stmia r1!, {r2-r8,r10}
-#endif
-
relocate_done:
#ifdef __XSCALE__