s3c244x hardware ecc
Holger Freyther
zecke at openmoko.org
Sat Jul 26 23:23:09 CEST 2008
Hey,
I had a look at using hardware ECC for the s3c244x. I'm in a state that I
patched uboot to write a ECC for dfu flashed stuff that the kernel likes to
read it and is happy.
What is left:
- Flag day? Provide a upgrade path?
- hardware_ecc=1 into the cmdline and then enable it in the kernel
- Check if the ECC is useful at all (have to look at the result of the
hardware register)
- Is the ECC config useful? We have main memory ECC0 and ECC1 but only write
in so small chunks that we fill up ECC0? How does this relate to the 2K page
- I have to learn more about OOB, ECC and NAND. And figure out why we do the
ECC over 256 bytes for LP...
- Find out why it is not twice as fast?
- Wonder why we only have 8-bit flash and if it is matters?
- Handle hardware_ecc=1 in the kernel and have a default for software..
(specially after the revert)...
attached:
- two uboot patches
- two kernel patches
- my primary log... for performance...
have fun
z.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0002-s3c2440-Enable-hardware-ECC-for-large-page-NAND-de.patch
Type: text/x-diff
Size: 4604 bytes
Desc: not available
Url : http://lists.openmoko.org/pipermail/openmoko-kernel/attachments/20080726/ac879ade/attachment.patch
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0001-gta02-Remove-the-code-as-it-is-marked-liked-this.patch
Type: text/x-diff
Size: 1000 bytes
Desc: not available
Url : http://lists.openmoko.org/pipermail/openmoko-kernel/attachments/20080726/ac879ade/attachment-0001.patch
-------------- next part --------------
Hardware ECC: 256 bytes
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 1.9 0.4 1524 564 ? Ss 16:16 0:05 init [5]
root 2 0.0 0.0 0 0 ? S< 16:16 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S< 16:16 0:00 [ksoftirqd/0]
root 4 0.0 0.0 0 0 ? S< 16:16 0:00 [watchdog/0]
root 5 0.1 0.0 0 0 ? S< 16:16 0:00 [events/0]
root 6 0.0 0.0 0 0 ? S< 16:16 0:00 [khelper]
root 79 0.0 0.0 0 0 ? S< 16:16 0:00 [kblockd/0]
root 85 0.0 0.0 0 0 ? S< 16:16 0:00 [ksuspend_usbd]
root 91 0.0 0.0 0 0 ? S< 16:16 0:00 [khubd]
root 94 0.0 0.0 0 0 ? S< 16:16 0:00 [kseriod]
root 101 0.0 0.0 0 0 ? S< 16:16 0:00 [kmmcd]
root 136 0.0 0.0 0 0 ? S 16:16 0:00 [pdflush]
root 137 0.0 0.0 0 0 ? S 16:16 0:00 [pdflush]
root 138 0.0 0.0 0 0 ? S< 16:16 0:00 [kswapd0]
root 139 0.0 0.0 0 0 ? S< 16:16 0:00 [aio/0]
root 157 0.0 0.0 0 0 ? S< 16:16 0:00 [kapmd]
root 189 0.0 0.0 0 0 ? S< 16:16 0:00 [glamo-spi-gpi]
root 199 0.0 0.0 0 0 ? S< 16:16 0:00 [mtdblockd]
root 228 0.0 0.0 0 0 ? S< 16:16 0:00 [spi_s3c24xx_g]
root 281 0.0 0.0 0 0 ? S< 16:16 0:00 [SDIO Helper]
root 285 0.0 0.0 0 0 ? S< 16:16 0:00 [SDIO Helper]
root 310 0.0 0.0 0 0 ? S< 16:16 0:00 [krfcommd]
root 1020 8.1 0.0 0 0 ? SN 16:17 0:21 [jffs2_gcd_mtd]
root 1750 0.1 0.5 2808 684 ? Ss 16:18 0:00 /sbin/syslogd -
root 1752 0.2 0.4 2744 608 ? Ss 16:18 0:00 /sbin/klogd -n
root 1819 0.1 0.6 2924 840 ttySAC2 Ss 16:19 0:00 -sh
root 1820 0.0 0.4 1764 540 tty1 Ss+ 16:19 0:00 /sbin/getty 384
root 1974 0.0 0.7 2248 884 ttySAC2 R+ 16:21 0:00 ps xua
root at om-gta02:~# cat /proc/partitions
major minor #blocks name
31 0 2048 mtdblock0
31 1 256 mtdblock1
31 2 256 mtdblock2
31 3 8192 mtdblock3
31 4 640 mtdblock4
31 5 256 mtdblock5
31 6 252544 mtdblock6
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 2.82s
user 0m 0.03s
sys 0m 0.72s
root at om-gta02:~# cat /proc/partitions
major minor #blocks name
31 0 2048 mtdblock0
31 1 256 mtdblock1
31 2 256 mtdblock2
31 3 8192 mtdblock3
31 4 640 mtdblock4
31 5 256 mtdblock5
31 6 252544 mtdblock6
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 3.10s
user 0m 0.02s
sys 0m 0.76s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 2.90s
user 0m 0.03s
sys 0m 0.70s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 2.88s
user 0m 0.00s
sys 0m 0.72s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 2.65s
user 0m 0.03s
sys 0m 0.68s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 3.14s
user 0m 0.04s
sys 0m 0.76s
Software ECC:
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 1.5 0.4 1524 564 ? Ss 15:26 0:06 init [5]
root 2 0.0 0.0 0 0 ? S< 15:26 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S< 15:26 0:00 [ksoftirqd/0]
root 4 0.0 0.0 0 0 ? S< 15:26 0:00 [watchdog/0]
root 5 0.1 0.0 0 0 ? S< 15:26 0:00 [events/0]
root 6 0.0 0.0 0 0 ? S< 15:26 0:00 [khelper]
root 79 0.0 0.0 0 0 ? S< 15:26 0:00 [kblockd/0]
root 85 0.0 0.0 0 0 ? S< 15:26 0:00 [ksuspend_usbd]
root 91 0.0 0.0 0 0 ? S< 15:26 0:00 [khubd]
root 94 0.0 0.0 0 0 ? S< 15:26 0:00 [kseriod]
root 101 0.0 0.0 0 0 ? S< 15:26 0:00 [kmmcd]
root 136 0.0 0.0 0 0 ? S 15:26 0:00 [pdflush]
root 137 0.0 0.0 0 0 ? S 15:26 0:00 [pdflush]
root 138 0.0 0.0 0 0 ? S< 15:26 0:00 [kswapd0]
root 139 0.0 0.0 0 0 ? S< 15:26 0:00 [aio/0]
root 157 0.0 0.0 0 0 ? S< 15:26 0:00 [kapmd]
root 189 0.0 0.0 0 0 ? S< 15:26 0:00 [glamo-spi-gpi]
root 199 0.0 0.0 0 0 ? S< 15:26 0:00 [mtdblockd]
root 228 0.0 0.0 0 0 ? S< 15:26 0:00 [spi_s3c24xx_g]
root 283 0.0 0.0 0 0 ? S< 15:26 0:00 [SDIO Helper]
root 287 0.0 0.0 0 0 ? S< 15:26 0:00 [SDIO Helper]
root 312 0.0 0.0 0 0 ? S< 15:26 0:00 [krfcommd]
root 1021 7.4 0.0 0 0 ? SN 15:27 0:26 [jffs2_gcd_mtd]
root 1755 0.1 0.5 2808 684 ? Ss 15:29 0:00 /sbin/syslogd -
root 1757 0.2 0.4 2744 608 ? Ss 15:29 0:00 /sbin/klogd -n
root 1824 0.1 0.6 2924 836 ttySAC2 Ss 15:29 0:00 -sh
root 1825 0.0 0.4 1764 540 tty1 Ss+ 15:29 0:00 /sbin/getty 384
root 1981 0.0 0.7 2248 884 ttySAC2 R+ 15:33 0:00 ps xua
root at om-gta02:~# time dd if=/dev/mtdblockX bs=1024 count=10240 of=/dev/null
dd: can't open '/dev/mtdblockX': No such file or directory
Command exited with non-zero status 1
real 0m 0.03s
user 0m 0.00s
sys 0m 0.02s
root at om-gta02:~#
root at om-gta02:~# time dd if=/dev/mtdblockX bs=1024 count=10240 of=/dev/null
root at om-gta02:~# ls /dev/mtd
/dev/mtd0 /dev/mtd2ro /dev/mtd5 /dev/mtdblock1 /dev/mtdblock6
/dev/mtd0ro /dev/mtd3 /dev/mtd5ro /dev/mtdblock2
/dev/mtd1 /dev/mtd3ro /dev/mtd6 /dev/mtdblock3
/dev/mtd1ro /dev/mtd4 /dev/mtd6ro /dev/mtdblock4
/dev/mtd2 /dev/mtd4ro /dev/mtdblock0 /dev/mtdblock5
root at om-gta02:~# ls /dev/mtd
/dev/mtd0 /dev/mtd2ro /dev/mtd5 /dev/mtdblock1 /dev/mtdblock6
/dev/mtd0ro /dev/mtd3 /dev/mtd5ro /dev/mtdblock2
/dev/mtd1 /dev/mtd3ro /dev/mtd6 /dev/mtdblock3
/dev/mtd1ro /dev/mtd4 /dev/mtd6ro /dev/mtdblock4
/dev/mtd2 /dev/mtd4ro /dev/mtdblock0 /dev/mtdblock5
root at om-gta02:~# ls /dev/mtdblock1
root at om-gta02:~# cat /proc/mtd
dev: size erasesize name
mtd0: 00200000 00010000 "physmap-flash.0"
mtd1: 00040000 00020000 "u-boot"
mtd2: 00040000 00020000 "u-boot_env"
mtd3: 00800000 00020000 "kernel"
mtd4: 000a0000 00020000 "splash"
mtd5: 00040000 00020000 "factory"
mtd6: 0f6a0000 00020000 "rootfs"
root at om-gta02:~# time dd if=/dev/mtdblock2 bs=1024 count=10240 of=/dev/null
256+0 records in
256+0 records out
real 0m 0.11s
user 0m 0.00s
sys 0m 0.04s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 3.60s
user 0m 0.02s
sys 0m 0.90s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 3.86s
user 0m 0.04s
sys 0m 0.90s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 3.94s
user 0m 0.03s
sys 0m 0.93s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 3.90s
user 0m 0.02s
sys 0m 0.90s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 3.97s
user 0m 0.03s
sys 0m 0.89s
root at om-gta02:~# time dd if=/dev/mtdblock6 bs=1024 count=10240 of=/dev/null
10240+0 records in
10240+0 records out
real 0m 3.96s
user 0m 0.06s
sys 0m 0.88s
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0002-Revert-s3c2440-nand-disable-hwecc.patch.patch
Type: text/x-diff
Size: 912 bytes
Desc: not available
Url : http://lists.openmoko.org/pipermail/openmoko-kernel/attachments/20080726/ac879ade/attachment-0002.patch
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0003-gta02-Disable-the-NAND-debugging-as-it-would-print.patch
Type: text/x-diff
Size: 802 bytes
Desc: not available
Url : http://lists.openmoko.org/pipermail/openmoko-kernel/attachments/20080726/ac879ade/attachment-0003.patch
More information about the openmoko-kernel
mailing list
