apm821xx: speed up ath9k-caldata extraction

Reading and writing to and from flash storage is slow and currently,
the ath10kcal_extract() scripts are even more at an disadvantage
because they use a block size of 1 to be able skip.

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

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

diff --git a/target/linux/apm821xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom b/target/linux/apm821xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index 7a13a0afa86569f11d21c32b340ef422dd7b27c2..6d2d18658dae46926a1ef816b1625565656ed4a7 100644 (file)
--- a/target/linux/apm821xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/apm821xx/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -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"
 }