Programmer’s Reference
not64
CMP | r5,#0x80 | ; is | it | 128MB? | |
BNE | not128 | ; | if | no, move on | |
MOV | r6,#0xe | ; | store | size and CAS latency of 2 | |
B | writesize |
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not128
;if it is none of these sizes then it is either 256MB, or
;there is no SDRAM fitted so default to 256MB.
MOV | r6,#0x12 | ; store size and CAS latency of 2 | ||
writesize |
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MOV | r1,r1,ASL#8 |
| ; get row address lines for SDRAM register | |
ORR | r2,r1,r2,ASL#12 | ; OR in | column address lines | |
ORR | r3,r2,r3,ASL#16 | ; OR in | number of banks | |
ORR | r6,r6,r3 |
| ; OR in | size and CAS latency |
LDR | r0, =CM_BASE | ; point | at module registers | |
STR | r6,[r0,#0x20] | ; store SDRAM parameters | ||
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© Copyright ARM Limited 1999. All rights reserved. | ARM DUI 0125A |