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| author | Matthias Weisser <weisserm@arcor.de> | 2011-03-10 21:36:32 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2011-04-27 19:38:07 +0200 |
| commit | d8834a1323af72f6145bc81adadd75185ef6065f (patch) | |
| tree | c8e04b59f251c9ea1e8dc0097ba8ca83a6fef31f /README | |
| parent | b65a77a8613d974cb665d14c51a012a8c12b8ba1 (diff) | |
| download | u-boot-imx-d8834a1323af72f6145bc81adadd75185ef6065f.zip u-boot-imx-d8834a1323af72f6145bc81adadd75185ef6065f.tar.gz u-boot-imx-d8834a1323af72f6145bc81adadd75185ef6065f.tar.bz2 | |
arm: Use optimized memcpy and memset from linux
Using optimized versions of memset and memcpy from linux brings a quite
noticeable speed (x2 or better) improvement for these two functions.
Here are some numbers for test done with jadecpu
| HEAD(1)| HEAD(1)| HEAD(2)| HEAD(2)|
| | +patch | | +patch |
---------------------------+--------+--------+--------+--------+
Reset to prompt | 438ms | 330ms | 228ms | 120ms |
| | | | |
TFTP a 3MB img | 4782ms | 3428ms | 3245ms | 2820ms |
| | | | |
FATLOAD USB a 3MB img* | 8515ms | 8510ms | ------ | ------ |
| | | | |
BOOTM LZO img in RAM | 3473ms | 3168ms | 592ms | 592ms |
where CRC is | 615ms | 615ms | 54ms | 54ms |
uncompress | 2460ms | 2462ms | 450ms | 451ms |
final boot_elf | 376ms | 68ms | 65ms | 65ms |
| | | | |
BOOTM LZO img in FLASH | 3207ms | 2902ms | 1050ms | 1050ms |
where CRC is | 600ms | 600ms | 135ms | 135ms |
uncompress | 2209ms | 2211ms | 828ms | 828ms |
| | | | |
Copy 1.4MB from NOR to RAM | 134ms | 72ms | 120ms | 70ms |
(1) No dcache
(2) dcache enabled in board_init
*Does not work when dcache is on
Size impact:
C version:
text data bss dec hex filename
202862 18912 266456 488230 77326 u-boot
ASM version:
text data bss dec hex filename
203798 18912 266288 488998 77626 u-boot
222712 u-boot.bin
Signed-off-by: Matthias Weisser <weisserm@arcor.de>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 6 |
1 files changed, 6 insertions, 0 deletions
@@ -2944,6 +2944,12 @@ Low Level (hardware related) configuration options: that is executed before the actual U-Boot. E.g. when compiling a NAND SPL. +- CONFIG_USE_ARCH_MEMCPY + CONFIG_USE_ARCH_MEMSET + If these options are used a optimized version of memcpy/memset will + be used if available. These functions may be faster under some + conditions but may increase the binary size. + Building the Software: ====================== |