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ar71xx: Speed up caldata/eeprom handling

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Reading and writing to and from flash storage is slowed down
enormously by some functions which use a block size of 1.

This patch reworks the extraction scripts to be much faster and
efficient by reading and writing in possibly one big block.

This is based on the initial commit a69e101 for ipq40xx by
Christian Lamparter <chunkeey@gmail.com>.

Speed comparison @ TP-Link TL-WDR4300 (just manually) results
in a time reduction by three orders of magnitude (99.9 %).

> time dd if=/dev/mtd3 of=/lib/firmware/test-slow bs=1 count=4096 skip=4096
4096+0 records in
4096+0 records out
real    0m 15.85s
user    0m 0.06s
sys     0m 13.28s

> time dd if=/dev/mtd3 of=/lib/firmware/test-fast bs=4096 count=1 skip=4096 iflag=skip_bytes
1+0 records in
1+0 records out
real    0m 0.02s
user    0m 0.00s
sys     0m 0.02s

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
This commit is contained in:
Adrian Schmutzler 2019-03-07 09:40:08 +01:00 committed by Christian Lamparter
parent e1ba59ea5c
commit 51fb186cb3
2 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
target/linux/ar71xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
View File

@ -20,7 +20,7 @@ ath9k_eeprom_extract() {
[ -n "$mtd" ] || \
ath9k_eeprom_die "no mtd device found for partition $part"
dd if=$mtd of=/lib/firmware/$FIRMWARE bs=1 skip=$offset count=$count 2>/dev/null || \
dd if=$mtd of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
ath9k_eeprom_die "failed to extract from $mtd"
}
@ -35,7 +35,7 @@ ath9k_ubi_eeprom_extract() {
[ -n "$ubi" ] || \
ath9k_eeprom_die "no UBI volume found for $part"
dd if=/dev/$ubi of=/lib/firmware/$FIRMWARE bs=1 skip=$offset count=$count 2>/dev/null || \
dd if=/dev/$ubi of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
ath9k_eeprom_die "failed to extract from $ubi"
}
@ -62,7 +62,7 @@ ath9k_patch_firmware_mac() {
[ -z "$mac" ] && return
macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=1 seek=2 count=6
macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc oflag=seek_bytes bs=6 seek=2 count=1
}
board=$(board_name)

6
target/linux/ar71xx/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
View File

@ -10,7 +10,7 @@ ath10kcal_from_file() {
local offset=$2
local count=$3
dd if=$source of=/lib/firmware/$FIRMWARE bs=1 skip=$offset count=$count 2>/dev/null || \
dd if=$source of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
ath10kcal_die "failed to extract calibration data from $source"
}
@ -30,7 +30,7 @@ ath10kcal_extract() {
[ "$count" = "$cal_size" ] || \
ath10kcal_die "no calibration data found in $part"
dd if=$mtd of=/lib/firmware/$FIRMWARE bs=1 skip=$offset count=$count 2>/dev/null || \
dd if=$mtd of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
ath10kcal_die "failed to extract calibration data from $mtd"
}
@ -39,7 +39,7 @@ ath10kcal_patch_mac() {
[ -z "$mac" ] && return
macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc bs=1 seek=6 count=6
macaddr_2bin $mac | dd of=/lib/firmware/$FIRMWARE conv=notrunc oflag=seek_bytes bs=6 seek=6 count=1
}
[ -e /lib/firmware/$FIRMWARE ] && exit 0