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| author | Stefan Roese <sr@denx.de> | 2010-05-27 16:45:20 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2010-07-01 10:26:25 +0200 |
| commit | 4978e6058440b6dc8f8f7498288c06291ba54b13 (patch) | |
| tree | 02fe6d3714c93750d28cc51afbd9a45d7104a414 | |
| parent | 2909ac03f4125c25903c2ac69a6ef0f6e807a53d (diff) | |
| download | u-boot-4978e6058440b6dc8f8f7498288c06291ba54b13.tar.gz u-boot-4978e6058440b6dc8f8f7498288c06291ba54b13.tar.xz u-boot-4978e6058440b6dc8f8f7498288c06291ba54b13.zip | |
ppc4xx: Cleanup Boot/FLASH TLB reassignment for PPC440/460
Background Info:
Some PPC440/460 boards have caches enabled in the Boot/FLASH TLB (via
init.S) to speed up the boot process. In relocate_code (start.S) the
cache inhibit attribute for this TLB is set to disable cache. This is
needed for the CFI FLASH driver.
This patch now cleans this code up:
- CONFIG_SYS_TLB_FOR_BOOT_FLASH is defined to 0 (default TLB) if not
defined in the top of this file. This way, we can remove an ugly
#ifdef in this code.
- Replace complex "#if defined(CONFIG_440EP) || defined(CONFIG_GR)..."
statement with "#if defined(CONFIG_440)".
- Remove unnecessary cache invalidate calls resulting in faster bootup.
Signed-off-by: Stefan Roese <sr@denx.de>
| -rw-r--r-- | arch/powerpc/cpu/ppc4xx/start.S | 21 |
1 files changed, 6 insertions, 15 deletions
diff --git a/arch/powerpc/cpu/ppc4xx/start.S b/arch/powerpc/cpu/ppc4xx/start.S index c739deb9b4..5296dad569 100644 --- a/arch/powerpc/cpu/ppc4xx/start.S +++ b/arch/powerpc/cpu/ppc4xx/start.S @@ -207,6 +207,10 @@ (0x00000000) #endif /* !defined(CONFIG_SYS_DCACHE_SACR_VALUE) */ +#if !defined(CONFIG_SYS_TLB_FOR_BOOT_FLASH) +#define CONFIG_SYS_TLB_FOR_BOOT_FLASH 0 /* use TLB 0 as default */ +#endif + #define function_prolog(func_name) .text; \ .align 2; \ .globl func_name; \ @@ -1457,34 +1461,21 @@ relocate_code: isync #endif /* CONFIG_SYS_INIT_RAM_DCACHE */ -#if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \ - defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \ - defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \ - defined(CONFIG_460EX) || defined(CONFIG_460GT) || \ - defined(CONFIG_460SX) /* * On some 440er platforms the cache is enabled in the first TLB (Boot-CS) * to speed up the boot process. Now this cache needs to be disabled. */ - iccci 0,0 /* Invalidate inst cache */ - dccci 0,0 /* Invalidate data cache, now no longer our stack */ - sync - isync - +#if defined(CONFIG_440) /* Clear all potential pending exceptions */ mfspr r1,SPRN_MCSR mtspr SPRN_MCSR,r1 -#ifdef CONFIG_SYS_TLB_FOR_BOOT_FLASH addi r1,r0,CONFIG_SYS_TLB_FOR_BOOT_FLASH /* Use defined TLB */ -#else - addi r1,r0,0x0000 /* Default TLB entry is #0 */ -#endif /* CONFIG_SYS_TLB_FOR_BOOT_FLASH */ tlbre r0,r1,0x0002 /* Read contents */ ori r0,r0,0x0c00 /* Or in the inhibit, write through bit */ tlbwe r0,r1,0x0002 /* Save it out */ sync isync -#endif /* defined(CONFIG_440EP) || ... || defined(CONFIG_460GT) */ +#endif /* defined(CONFIG_440) */ mr r1, r3 /* Set new stack pointer */ mr r9, r4 /* Save copy of Init Data pointer */ mr r10, r5 /* Save copy of Destination Address */ |