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-rw-r--r--cpu/ppc4xx/start.S69
1 files changed, 39 insertions, 30 deletions
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
index 9626b65..81a15fe 100644
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -800,7 +800,7 @@ _start:
/*----------------------------------------------------------------------- */
/* Enable two 128MB cachable regions. */
/*----------------------------------------------------------------------- */
- addis r1,r0,0x8000
+ addis r1,r0,0xc000
addi r1,r1,0x0001
mticcr r1 /* instruction cache */
@@ -823,12 +823,23 @@ _start:
/*****************************************************************************/
#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || \
defined(CONFIG_405EP) || defined(CONFIG_405EZ) || \
- defined(CONFIG_405)
+ defined(CONFIG_405EX) || defined(CONFIG_405)
/*----------------------------------------------------------------------- */
/* Clear and set up some registers. */
/*----------------------------------------------------------------------- */
addi r4,r0,0x0000
+#if !defined(CONFIG_405EX)
mtspr sgr,r4
+#else
+ /*
+ * On 405EX, completely clearing the SGR leads to PPC hangup
+ * upon PCIe configuration access. The PCIe memory regions
+ * need to be guarded!
+ */
+ lis r3,0x0000
+ ori r3,r3,0x7FFC
+ mtspr sgr,r3
+#endif
mtspr dcwr,r4
mtesr r4 /* clear Exception Syndrome Reg */
mttcr r4 /* clear Timer Control Reg */
@@ -851,7 +862,7 @@ _start:
/*----------------------------------------------------------------------- */
/* Enable two 128MB cachable regions. */
/*----------------------------------------------------------------------- */
- lis r4,0x8000
+ lis r4,0xc000
ori r4,r4,0x0001
mticcr r4 /* instruction cache */
isync
@@ -860,12 +871,34 @@ _start:
ori r4,r4,0x0000
mtdccr r4 /* data cache */
-#if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR))
+#if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR)) || defined(CONFIG_405EX)
/*----------------------------------------------------------------------- */
/* Tune the speed and size for flash CS0 */
/*----------------------------------------------------------------------- */
bl ext_bus_cntlr_init
#endif
+#if !(defined(CFG_INIT_DCACHE_CS) || defined(CFG_TEMP_STACK_OCM))
+ /*
+ * Boards like the Kilauea (405EX) don't have OCM and can't use
+ * DCache for init-ram. So setup stack here directly after the
+ * SDRAM is initialized.
+ */
+ lis r1, CFG_INIT_RAM_ADDR@h
+ ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack in SDRAM */
+
+ li r0, 0 /* Make room for stack frame header and */
+ stwu r0, -4(r1) /* clear final stack frame so that */
+ stwu r0, -4(r1) /* stack backtraces terminate cleanly */
+ /*
+ * Set up a dummy frame to store reset vector as return address.
+ * this causes stack underflow to reset board.
+ */
+ stwu r1, -8(r1) /* Save back chain and move SP */
+ lis r0, RESET_VECTOR@h /* Address of reset vector */
+ ori r0, r0, RESET_VECTOR@l
+ stwu r1, -8(r1) /* Save back chain and move SP */
+ stw r0, +12(r1) /* Save return addr (underflow vect) */
+#endif /* !(CFG_INIT_DCACHE_CS || !CFG_TEM_STACK_OCM) */
#if defined(CONFIG_405EP)
/*----------------------------------------------------------------------- */
@@ -983,7 +1016,7 @@ start_ram:
ori r4,r4,0xa000
mtdcr ebccfgd,r4
- /* turn on data chache for this region */
+ /* turn on data cache for this region */
lis r4,0x0080
mtdccr r4
@@ -1049,30 +1082,6 @@ start_ram:
/*----------------------------------------------------------------------- */
bl sdram_init
- /*
- * Setup temporary stack pointer only for boards
- * that do not use SDRAM SPD I2C stuff since it
- * is already initialized to use DCACHE or OCM
- * stacks.
- */
-#if !(defined(CFG_INIT_DCACHE_CS) || defined(CFG_TEMP_STACK_OCM))
- lis r1, CFG_INIT_RAM_ADDR@h
- ori r1,r1,CFG_INIT_SP_OFFSET /* set up the stack in SDRAM */
-
- li r0, 0 /* Make room for stack frame header and */
- stwu r0, -4(r1) /* clear final stack frame so that */
- stwu r0, -4(r1) /* stack backtraces terminate cleanly */
- /*
- * Set up a dummy frame to store reset vector as return address.
- * this causes stack underflow to reset board.
- */
- stwu r1, -8(r1) /* Save back chain and move SP */
- lis r0, RESET_VECTOR@h /* Address of reset vector */
- ori r0, r0, RESET_VECTOR@l
- stwu r1, -8(r1) /* Save back chain and move SP */
- stw r0, +12(r1) /* Save return addr (underflow vect) */
-#endif /* !(CFG_INIT_DCACHE_CS || !CFG_TEM_STACK_OCM) */
-
#ifdef CONFIG_NAND_SPL
bl nand_boot /* will not return */
#else
@@ -1273,7 +1282,7 @@ icache_enable:
bl invalidate_icache
mtlr r8
isync
- addis r3,r0, 0x8000 /* set bit 0 */
+ addis r3,r0, 0xc000 /* set bit 0 */
mticcr r3
blr