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bcm53xx: use iflag=skip_bytes for dd command during sysupgrade

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Since BusyBox 1.25.0 dd command supports iflag=skip_bytes which allows
skipping requested amount of bytes without reducing blocksize. Thanks to
this we can leave default blocksize and let dd work more efficiently.

On Netgear R6250 "dd skip=58 iflag=skip_bytes" can be 5 times faster
than "dd bs=58 skip=1" when extracting TRX out of CHK.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2017-12-23 23:14:25 +01:00
parent 612a93564c
commit 3267ce750e
1 changed files with 2 additions and 2 deletions
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4
target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
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@ -274,11 +274,11 @@ platform_pre_upgrade() {
platform_trx_from_chk_cmd() { platform_trx_from_chk_cmd() {
local header_len=$((0x$(get_magic_long_at "$1" 4))) local header_len=$((0x$(get_magic_long_at "$1" 4)))
echo -n dd bs=$header_len skip=1 echo -n dd skip=$header_len iflag=skip_bytes
} }
platform_trx_from_cybertan_cmd() { platform_trx_from_cybertan_cmd() {
echo -n dd bs=32 skip=1 echo -n dd skip=32 iflag=skip_bytes
} }
platform_img_from_safeloader() { platform_img_from_safeloader() {