mips: disable caches in bootblock startup code
Until proper MIPS cache management is available it is necessary to disable data and instruction caches, otherwise code placed in memory stays in data cache and is not available for instruction fetched. BRANCH=none BUG=chrome-os-partner:31438,chrome-os-partner:34127 TEST=coreboot loading rombase and rambase now succeeds. Change-Id: I4147e1325edc0b9bb951cd7ce18d5f104f3eaec0 Signed-off-by: Stefan Reinauer <reinauer@chromium.org> Original-Commit-Id: 93d5bfa1d01fbbabbabef33a22287ceeea28b15b Original-Change-Id: Ib195ed6e5f08ccaa6bbe3325c2199171bfb63b88 Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/232191 Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/9569 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
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@ -36,6 +36,16 @@ _start:
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bne $t0, $t1, 1b
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addi $t0, $t0, 4
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/*
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* Disable caches for now, proper cache management is coming soon.
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* http://crosbug.com/p/34127
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*/
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mfc0 $t0, $16
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li $t1, -8
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and $t0, $t0, $t1
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ori $t0, $t0, 2
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mtc0 $t0, $16
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/* Run main */
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b main
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