diff options
Diffstat (limited to 'cpu')
| -rw-r--r-- | cpu/at91rm9200/start.S | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/cpu/at91rm9200/start.S b/cpu/at91rm9200/start.S index 43ab93d..0dbc009 100644 --- a/cpu/at91rm9200/start.S +++ b/cpu/at91rm9200/start.S @@ -127,21 +127,20 @@ reset: * is why it's called lowlevelinit */ bl lowlevelinit /* in lowlevel.S */ - bl icache_enable; - /*------------------------------------ - Read/modify/write CP15 control register - ------------------------------------- - read cp15 control register (cp15 r1) in r0 - ------------------------------------*/ - mrc p15, 0, r0, c1, c0, 0 - /* Reset bit :Little Endian end fast bus mode */ - ldr r3, =0xC0000080 - /* Set bit :Asynchronous clock mode, Not Fast Bus */ - ldr r4, =0xC0000000 - bic r0, r0, r3 - orr r0, r0, r4 - /* write r0 in cp15 control register (cp15 r1) */ - mcr p15, 0, r0, c1, c0, 0 + + /* + * Read/modify/write CP15 control register + * disable MMU, enable I-Cache, select Asychronous Clocking Mode + */ + + mrc p15, 0, r0, c1, c0, 0 @ read cp15 control register (cp15 r1) in r0 + bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS) + bic r0, r0, #0x0000008f @ clear bits 7, 3:0 (B--- WCAM) + orr r0, r0, #0x00000002 @ set bit 2 (A) Align + orr r0, r0, #0x00000004 @ set bit 3 (C) D-Cache + orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache + orr r0, r0, #0xC0000000 @ set bits 31:30 (iA, nF) + mcr p15, 0, r0, c1, c0, 0 @ write r0 in cp15 control register (cp15 r1) #endif /* CONFIG_BOOTBINFUNC */ /* * relocate exeception table |