MIPS: Add CONFIG_SKIP_LOWLEVEL_INIT

This patch adds the CONFIG_SKIP_LOWLEVEL_INIT option to start.S. This enables support for boards where the lowlevel initialization is already done when U-Boot runs (e.g. via OnChip ROM).

This will be used in the upcoming VCTH board support.

Signed-off-by Stefan Roese <[email protected]>

---
 cpu/mips/start.S |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

cpu/mips/start.S +4 -0

index 0a69109..57db589 100644
@@ -243,9 +243,11 @@ reset:
 	mtc0	zero, CP0_COUNT
 	mtc0	zero, CP0_COMPARE
 
+#if !defined(CONFIG_SKIP_LOWLEVEL_INIT)
 	/* CONFIG0 register */
 	li	t0, CONF_CM_UNCACHED
 	mtc0	t0, CP0_CONFIG
+#endif /* !CONFIG_SKIP_LOWLEVEL_INIT */
 
 	/* Initialize $gp.
 	 */

@@ -255,6 +257,7 @@ reset:
 1:
 	lw	gp, 0(ra)
 
+#if !defined(CONFIG_SKIP_LOWLEVEL_INIT)
 	/* Initialize any external memory.
 	 */
 	la	t9, lowlevel_init

@@ -271,6 +274,7 @@ reset:
 	 */
 	li	t0, CONF_CM_CACHABLE_NONCOHERENT
 	mtc0	t0, CP0_CONFIG
+#endif /* !CONFIG_SKIP_LOWLEVEL_INIT */
 
 	/* Set up temporary stack.
 	 */