diff options
Diffstat (limited to 'cpu/ppc4xx/start.S')
| -rw-r--r-- | cpu/ppc4xx/start.S | 69 |
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 |