MIPS: If we don't need DDR for cache init, init cache first

On systems where cache initialisation doesn't require zeroed memory (ie.
systems where CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD is not defined)
perform cache initialisation prior to lowlevel_init & DDR
initialisation. This allows for DDR initialisation code to run cached &
thus significantly faster.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>

diff --git a/arch/mips/cpu/start.S b/arch/mips/cpu/start.S
index 6aec430a670ceb3223b92fd5ab70600e70eacbc0..6f1d2192b0d30944441112bda2deb6eb0f02aa8a 100644 (file)
--- a/arch/mips/cpu/start.S
+++ b/arch/mips/cpu/start.S
@@ -142,15 +142,24 @@ reset:
        PTR_L   gp, 0(ra)
 
 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
+# ifdef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
        /* Initialize any external memory */
        PTR_LA  t9, lowlevel_init
        jalr    t9
         nop
+# endif
 
        /* Initialize caches... */
        PTR_LA  t9, mips_cache_reset
        jalr    t9
         nop
+
+# ifndef CONFIG_SYS_MIPS_CACHE_INIT_RAM_LOAD
+       /* Initialize any external memory */
+       PTR_LA  t9, lowlevel_init
+       jalr    t9
+        nop
+# endif
 #endif
 
        /* Set up temporary stack */