diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc85xx/start.S')
| -rw-r--r-- | arch/powerpc/cpu/mpc85xx/start.S | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S index e519f35..d494528 100644 --- a/arch/powerpc/cpu/mpc85xx/start.S +++ b/arch/powerpc/cpu/mpc85xx/start.S @@ -411,6 +411,33 @@ create_ccsr_old_tlb: msync tlbwe + /* + * We have a TLB for what we think is the current (old) CCSR. Let's + * verify that, otherwise we won't be able to move it. + * CONFIG_SYS_CCSRBAR_DEFAULT is always a 32-bit number, so we only + * need to compare the lower 32 bits of CCSRBAR on CoreNet systems. + */ +verify_old_ccsr: + lis r0, CONFIG_SYS_CCSRBAR_DEFAULT@h + ori r0, r0, CONFIG_SYS_CCSRBAR_DEFAULT@l +#ifdef CONFIG_FSL_CORENET + lwz r1, 4(r9) /* CCSRBARL */ +#else + lwz r1, 0(r9) /* CCSRBAR, shifted right by 12 */ + slwi r1, r1, 12 +#endif + + cmpl 0, r0, r1 + + /* + * If the value we read from CCSRBARL is not what we expect, then + * enter an infinite loop. This will at least allow a debugger to + * halt execution and examine TLBs, etc. There's no point in going + * on. + */ +infinite_debug_loop: + bne infinite_debug_loop + #ifdef CONFIG_FSL_CORENET #define CCSR_LAWBARH0 (CONFIG_SYS_CCSRBAR + 0x1000) |