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| author | Heiko Schocher <hs@denx.de> | 2010-09-17 13:10:30 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-09-19 19:29:51 +0200 |
| commit | c3330e9d6a11b6ead4a2346001338ce884b5832b (patch) | |
| tree | f4fddc3272964e0cc047308533e6c2f642ee5870 /arch/arm | |
| parent | 880eff5cfb9df6f0855f4e48affd349ca64692e9 (diff) | |
| download | u-boot-imx-c3330e9d6a11b6ead4a2346001338ce884b5832b.zip u-boot-imx-c3330e9d6a11b6ead4a2346001338ce884b5832b.tar.gz u-boot-imx-c3330e9d6a11b6ead4a2346001338ce884b5832b.tar.bz2 | |
ARM (ARM926ejs): add data cache support, tested on magnesium and tx25 board
Enable "cache" command on tx25 and magnesium board and test performance.
Test 1: Loading 127 MB of data from NAND flash into RAM:
Instr. Cache off on on
Data Cache off off on
--------------------------------------------------
magnesium 32,6s 22,5s 30s = x 1,09
tx25 (29MB only) 9,69s 5,05s 8,16s = x 1,19
Test 2: uncompressing a gzipped image from RAM to RAM
(size compressed: 6.5 MiB, uncompressed: 35 MiB):
Instr. Cache off on on
Data Cache off off on
--------------------------------------------------
magnesium 4,25s 2,08s 1,72s = x 2,47
tx25 4,82s 2,04s 1,84s = x 2,62
Portions of this work were supported by funding from
the CE Linux Forum.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Alessandro Rubini <rubini@gnudd.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/lib/cache.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/lib/cache.c b/arch/arm/lib/cache.c index 61ee9d3..b36fd24 100644 --- a/arch/arm/lib/cache.c +++ b/arch/arm/lib/cache.c @@ -32,5 +32,11 @@ void flush_cache (unsigned long dummy1, unsigned long dummy2) arm1136_cache_flush(); #endif +#ifdef CONFIG_ARM926EJS + /* test and clean, page 2-23 of arm926ejs manual */ + asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory"); + /* disable write buffer as well (page 2-22) */ + asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0)); +#endif return; } |