The process to download in Solid State Drive and Hard Disk Drive is a little different. In case of SDD we can burn the firmware in one command, but in case of HDD we need to write in a loop since there is a limitation of 0x80000 bytes on VFS module system call.
if [ "$rev" != "$target_fw_ver" ]; then
echo "Upgrading $disk_type firmware to version $target_fw_ver on $x i.e.$sg_dev..."
if [ "$disk_type" = "ssd" ]; then
sg_write_buffer --in=${fwfile} --mode=5 --id=0 $sg_dev
if [ $? -ne 0 ]; then
echo "Failed to upgrade SSD firmware on $x i.e.$sg_dev to version $target_fw_ver!" >&2
exit 1
fi
else
# hdd firmware upgrade
bytes=`ls -l $fwfile | awk '{ print $5; }'`
start=0
#length = 0x80000 Bytes
length=524288
while [ $start -lt $bytes ]; do
if let 'start+length>bytes'; then
let 'length=bytes-start'
fi
sg_write_buffer --in=$fwfile --skip=$start --offset=$start --length=$length --mode=0x7 --id=0 $sg_dev
if [ $? -ne 0 ]; then
echo "Failed to upgrade HDD firmware $x i.e.$sg_dev to version $target_fw_ver!" >&2
exit 1
fi
let start+=length
done
fi
