diff options
Diffstat (limited to 'cpu/ppc4xx')
| -rw-r--r-- | cpu/ppc4xx/start.S | 206 |
1 files changed, 80 insertions, 126 deletions
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S index a5d9ec9..25ee369 100644 --- a/cpu/ppc4xx/start.S +++ b/cpu/ppc4xx/start.S @@ -187,6 +187,10 @@ * at CFG_SDRAM_BASE and another 128MB cacheable instruction region covering * NOR flash at CFG_FLASH_BASE. Disable all cacheable data regions. */ +#if !defined(CFG_FLASH_BASE) +/* If not already defined, set it to the "last" 128MByte region */ +# define CFG_FLASH_BASE 0xf8000000 +#endif #if !defined(CFG_ICACHE_SACR_VALUE) # define CFG_ICACHE_SACR_VALUE \ (PPC_128MB_SACR_VALUE(CFG_SDRAM_BASE + ( 0 << 20)) | \ @@ -486,97 +490,6 @@ rsttlb: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/ /* Continue from 'normal' start */ /*----------------------------------------------------------------*/ 2: - -#if defined(CONFIG_NAND_SPL) -#if defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \ - defined(CONFIG_460EX) || defined(CONFIG_460GT) - /* - * Enable internal SRAM (only on 440EPx/GRx, 440EP/GR have no OCM) - */ - lis r2,0x7fff - ori r2,r2,0xffff - mfdcr r1,isram0_dpc - and r1,r1,r2 /* Disable parity check */ - mtdcr isram0_dpc,r1 - mfdcr r1,isram0_pmeg - and r1,r1,r2 /* Disable pwr mgmt */ - mtdcr isram0_pmeg,r1 -#if defined(CONFIG_460EX) || defined(CONFIG_460GT) - lis r1,0x4000 /* BAS = 8000_0000 */ - ori r1,r1,0x4580 /* 16k */ - mtdcr isram0_sb0cr,r1 -#endif -#endif -#if defined(CONFIG_440EP) - /* - * On 440EP with no internal SRAM, we setup SDRAM very early - * and copy the NAND_SPL to SDRAM and jump to it - */ - /* Clear Dcache to use as RAM */ - addis r3,r0,CFG_INIT_RAM_ADDR@h - ori r3,r3,CFG_INIT_RAM_ADDR@l - addis r4,r0,CFG_INIT_RAM_END@h - ori r4,r4,CFG_INIT_RAM_END@l - rlwinm. r5,r4,0,27,31 - rlwinm r5,r4,27,5,31 - beq ..d_ran3 - addi r5,r5,0x0001 -..d_ran3: - mtctr r5 -..d_ag3: - dcbz r0,r3 - addi r3,r3,32 - bdnz ..d_ag3 - /*----------------------------------------------------------------*/ - /* Setup the stack in internal SRAM */ - /*----------------------------------------------------------------*/ - lis r1,CFG_INIT_RAM_ADDR@h - ori r1,r1,CFG_INIT_SP_OFFSET@l - li r0,0 - stwu r0,-4(r1) - stwu r0,-4(r1) /* Terminate call chain */ - - 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) */ - sync - bl early_sdram_init - sync -#endif /* CONFIG_440EP */ - - /* - * Copy SPL from cache into internal SRAM - */ - li r4,(CFG_NAND_BOOT_SPL_SIZE >> 2) - 1 - mtctr r4 - lis r2,CFG_NAND_BOOT_SPL_SRC@h - ori r2,r2,CFG_NAND_BOOT_SPL_SRC@l - lis r3,CFG_NAND_BOOT_SPL_DST@h - ori r3,r3,CFG_NAND_BOOT_SPL_DST@l -spl_loop: - lwzu r4,4(r2) - stwu r4,4(r3) - bdnz spl_loop - - /* - * Jump to code in RAM - */ - bl 00f -00: mflr r10 - lis r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@h - ori r3,r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@l - sub r10,r10,r3 - addi r10,r10,28 - mtlr r10 - blr - -start_ram: - sync - isync -#endif /* CONFIG_NAND_SPL */ - bl 3f b _start @@ -831,7 +744,7 @@ _start: stw r0,+12(r1) /* Save return addr (underflow vect) */ #ifdef CONFIG_NAND_SPL - bl nand_boot /* will not return */ + bl nand_boot_common /* will not return */ #else GET_GOT @@ -992,12 +905,13 @@ _start: ori r4, r4, CFG_DCACHE_SACR_VALUE@l mtdccr r4 -#if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR)) || defined(CONFIG_405EX) +#if !(defined(CFG_EBC_PB0AP) && defined(CFG_EBC_PB0CR)) /*----------------------------------------------------------------------- */ /* 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)) /* * For boards that don't have OCM and can't use the data cache @@ -1085,38 +999,6 @@ _start: #endif /* CONFIG_405EZ */ #endif -#ifdef CONFIG_NAND_SPL - /* - * Copy SPL from cache into internal SRAM - */ - li r4,(CFG_NAND_BOOT_SPL_SIZE >> 2) - 1 - mtctr r4 - lis r2,CFG_NAND_BOOT_SPL_SRC@h - ori r2,r2,CFG_NAND_BOOT_SPL_SRC@l - lis r3,CFG_NAND_BOOT_SPL_DST@h - ori r3,r3,CFG_NAND_BOOT_SPL_DST@l -spl_loop: - lwzu r4,4(r2) - stwu r4,4(r3) - bdnz spl_loop - - /* - * Jump to code in RAM - */ - bl 00f -00: mflr r10 - lis r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@h - ori r3,r3,(CFG_NAND_BOOT_SPL_SRC - CFG_NAND_BOOT_SPL_DST)@l - sub r10,r10,r3 - addi r10,r10,28 - mtlr r10 - blr - -start_ram: - sync - isync -#endif /* CONFIG_NAND_SPL */ - /*----------------------------------------------------------------------- */ /* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */ /*----------------------------------------------------------------------- */ @@ -1243,7 +1125,7 @@ start_ram: bl sdram_init #ifdef CONFIG_NAND_SPL - bl nand_boot /* will not return */ + bl nand_boot_common /* will not return */ #else GET_GOT /* initialize GOT access */ @@ -2180,3 +2062,75 @@ pll_wait: blr function_epilog(mftlb1) #endif /* CONFIG_440 */ + +#if defined(CONFIG_NAND_SPL) +/* + * void nand_boot_relocate(dst, src, bytes) + * + * r3 = Destination address to copy code to (in SDRAM) + * r4 = Source address to copy code from + * r5 = size to copy in bytes + */ +nand_boot_relocate: + mr r6,r3 + mr r7,r4 + mflr r8 + + /* + * Copy SPL from icache into SDRAM + */ + subi r3,r3,4 + subi r4,r4,4 + srwi r5,r5,2 + mtctr r5 +..spl_loop: + lwzu r0,4(r4) + stwu r0,4(r3) + bdnz ..spl_loop + + /* + * Calculate "corrected" link register, so that we "continue" + * in execution in destination range + */ + sub r3,r7,r6 /* r3 = src - dst */ + sub r8,r8,r3 /* r8 = link-reg - (src - dst) */ + mtlr r8 + blr + +nand_boot_common: + /* + * First initialize SDRAM. It has to be available *before* calling + * nand_boot(). + */ + lis r3,CFG_SDRAM_BASE@h + ori r3,r3,CFG_SDRAM_BASE@l + bl initdram + + /* + * Now copy the 4k SPL code into SDRAM and continue execution + * from there. + */ + lis r3,CFG_NAND_BOOT_SPL_DST@h + ori r3,r3,CFG_NAND_BOOT_SPL_DST@l + lis r4,CFG_NAND_BOOT_SPL_SRC@h + ori r4,r4,CFG_NAND_BOOT_SPL_SRC@l + lis r5,CFG_NAND_BOOT_SPL_SIZE@h + ori r5,r5,CFG_NAND_BOOT_SPL_SIZE@l + bl nand_boot_relocate + + /* + * We're running from SDRAM now!!! + * + * It is necessary for 4xx systems to relocate from running at + * the original location (0xfffffxxx) to somewhere else (SDRAM + * preferably). This is because CS0 needs to be reconfigured for + * NAND access. And we can't reconfigure this CS when currently + * "running" from it. + */ + + /* + * Finally call nand_boot() to load main NAND U-Boot image from + * NAND and jump to it. + */ + bl nand_boot /* will not return */ +#endif /* CONFIG_NAND_SPL */ |