diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/mvme3100/start/start.S')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/mvme3100/start/start.S | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/mvme3100/start/start.S b/c/src/lib/libbsp/powerpc/mvme3100/start/start.S index cab9261c0a..485a00483d 100644 --- a/c/src/lib/libbsp/powerpc/mvme3100/start/start.S +++ b/c/src/lib/libbsp/powerpc/mvme3100/start/start.S @@ -25,6 +25,13 @@ #define KERNELBASE 0x0 +/* cannot include <bsp.h> from assembly :-( */ +#ifndef BSP_8540_CCSR_BASE +#define BSP_8540_CCSR_BASE 0xe1000000 +#endif + +#define ERR_DISABLE_REG (BSP_8540_CCSR_BASE + 0x2e44) + .text .globl __rtems_entry_point .type __rtems_entry_point,@function @@ -34,6 +41,25 @@ __rtems_entry_point: mr r29,r5 mr r28,r6 mr r27,r7 + /* disable checking for memory-select errors; motload has all TLBs + * mapping a possible larger area as memory (not-guarded, caching-enabled) + * than actual physical memory is available. + * In case of speculative loads this may cause 'memory-select' errors + * which seem to raise 'core_fault_in' (found no description in + * the manual but I experienced this problem). + * Such errors (if HID1[RFXE] is clear) may *stall* execution + * leading to mysterious 'hangs'. + * Note: enabling HID1[RFXE] at this point makes no sense since + * exceptions are not configured yet. Therefore we disable + * memory-select errors. + * Eventually (bspstart.c) we want to delete TLB entries for + * which no physical memory is present. + */ + lis r3, ERR_DISABLE_REG@ha + lwz r4, ERR_DISABLE_REG@l(r3) + /* disable memory-select errors */ + ori r4, r4, 1 + stw r4, ERR_DISABLE_REG@l(r3) /* Use MotLoad's TLB setup for now; caches are on already */ bl __eabi /* setup EABI and SYSV environment */ |