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Patch by Steven Scholz, 13 March 2005:

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fix cache enabling for AT91RM9200
This commit is contained in:
wdenk 2005-04-01 09:14:58 +00:00
parent ea287debe1
commit f50cc09b61
2 changed files with 17 additions and 15 deletions
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3
CHANGELOG
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@ -2,6 +2,9 @@
Changes for U-Boot 1.1.3:
======================================================================
* Patch by Steven Scholz, 13 March 2005:
fix cache enabling for AT91RM9200
* Patch by Masami Komiya, 30 Mar 2005:
add SNTP support and expand time server and time offset fields of
DHCP support. See doc/README.SNTP

29
cpu/at91rm9200/start.S
View File

@ -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