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Suport disabling the lower half of the instruction cache.

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This commit is contained in:
Our Air Quality 2017-12-19 14:29:36 +11:00
parent 8ea1774e1d
commit 9d57176d8e
1 changed files with 8 additions and 2 deletions
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10
core/spiflash-cache-enable.S
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@ -22,6 +22,10 @@
rboot_megabyte: rboot_megabyte:
.byte RBOOT_MEGABYTE_DEFAULT .byte RBOOT_MEGABYTE_DEFAULT
.global enable_low_icache
enable_low_icache:
.byte 1
.section .data .section .data
.local cache_return_save .local cache_return_save
.align 4 .align 4
@ -44,7 +48,8 @@ Cache_Read_Enable:
/* map the first megabyte of flash */ /* map the first megabyte of flash */
movi a2, 0 movi a2, 0
movi a3, 0 movi a3, 0
movi a4, 1 movi a4, enable_low_icache
l8ui a4, a4, 0
call0 rom_Cache_Read_Enable call0 rom_Cache_Read_Enable
movi a3, RBOOT_CONFIG_BASE movi a3, RBOOT_CONFIG_BASE
@ -67,7 +72,8 @@ Cache_Read_Enable:
l32i a4, a4, 0 l32i a4, a4, 0
extui a2, a4, 0, 1 /* a2 is now lsb of a4 (odd/even) */ extui a2, a4, 0, 1 /* a2 is now lsb of a4 (odd/even) */
srli a3, a4, 1 /* a3 is half value of mb */ srli a3, a4, 1 /* a3 is half value of mb */
movi a4, 1 movi a4, enable_low_icache
l8ui a4, a4, 0
call0 rom_Cache_Read_Enable call0 rom_Cache_Read_Enable
movi a0, cache_return_save /* restore a0 return address */ movi a0, cache_return_save /* restore a0 return address */
l32i a0, a0, 0 l32i a0, a0, 0