arm: Tegra2: Fix ELDK42 gcc failure with inline asm stack pointer load

The 4.2.2 gcc in the ELDK42 release doesn't like the direct SP
load using a constant in tegra2_start. Change it to use a load
thru another reg using mov sp, %0 : : "r"(CONST).

Tested on my Seaboard T20-A03, U-Boot loads and runs OK. Also
compiled all tegra2 builds with both gcc 4.2.2 and 4.4.1 OK.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/arm/cpu/armv7/tegra2/ap20.c b/arch/arm/cpu/armv7/tegra2/ap20.c
index 4c44bb3637736902970a72b207c350110455725a..f0450f4c01898eb1366b4aa552b39a2b01e2f90e 100644 (file)
--- a/arch/arm/cpu/armv7/tegra2/ap20.c
+++ b/arch/arm/cpu/armv7/tegra2/ap20.c
@@ -298,11 +298,11 @@ void tegra2_start(void)
                writel(0xC0, &pmt->pmt_cfg_ctl);
 
                /*
-               * If we are ARM7 - give it a different stack. We are about to
-               * start up the A9 which will want to use this one.
-               */
-               asm volatile("ldr       sp, =%c0\n"
-                       : : "i"(AVP_EARLY_BOOT_STACK_LIMIT));
+                * If we are ARM7 - give it a different stack. We are about to
+                * start up the A9 which will want to use this one.
+                */
+               asm volatile("mov       sp, %0\n"
+                       : : "r"(AVP_EARLY_BOOT_STACK_LIMIT));
 
                start_cpu((u32)_start);
                halt_avp();