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ARM (ARM926ejs): add data cache support, tested on magnesium and tx25 board

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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>
This commit is contained in:
Heiko Schocher 2010-09-17 13:10:30 +02:00 • committed by Wolfgang Denk
parent 880eff5cfb
commit c3330e9d6a
3 changed files with 8 additions and 0 deletions
arch/arm/lib
cache.c
include/configs
imx27lite-common.htx25.h

6
arch/arm/lib/cache.c
View file

@ -31,6 +31,12 @@ void flush_cache (unsigned long dummy1, unsigned long dummy2)
void arm1136_cache_flush(void); void arm1136_cache_flush(void);
arm1136_cache_flush(); 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 #endif
return; return;
} }

1
include/configs/imx27lite-common.h
View file

@ -188,6 +188,7 @@
*/ */
#include <config_cmd_default.h> #include <config_cmd_default.h>
#define CONFIG_CMD_ASKENV #define CONFIG_CMD_ASKENV
#define CONFIG_CMD_CACHE
#define CONFIG_CMD_DHCP #define CONFIG_CMD_DHCP
#define CONFIG_CMD_DIAG #define CONFIG_CMD_DIAG
#define CONFIG_CMD_FAT #define CONFIG_CMD_FAT

1
include/configs/tx25.h
View file

@ -131,6 +131,7 @@
/* U-Boot commands */ /* U-Boot commands */
#include <config_cmd_default.h> #include <config_cmd_default.h>
#define CONFIG_CMD_NAND #define CONFIG_CMD_NAND
#define CONFIG_CMD_CACHE
/* /*
* Ethernet * Ethernet