1#!/bin/sh 2# $NetBSD: walnut-mkimg.sh,v 1.6 2024/12/11 00:06:58 maya Exp $ 3 4# Convert an input to a TFTP image loadable by the IBM PowerPC OpenBIOS. 5 6magic=5394511 # IBM OpenBIOS magic number 0x0052504f 7start=0 8size=0 9overwrite=0 10 11if [ $# -ne 2 ] ; then 12 echo usage: $0 input image 1>&2 13 exit 1 14fi 15 16input=$1; shift 17output=$1; shift 18 19: ${OBJDUMP=objdump} 20: ${OBJCOPY=objcopy} 21: ${STAT=stat} 22: ${AWK=awk} 23: ${FILE=file} 24 25file=$( ${FILE} $input ) 26case $file in 27*:\ ELF\ *) 28 start=`${OBJDUMP} -f ${input} | ${AWK} '/start address/ { print $NF }'` 29 start=`printf "%d" $start` 30 ${OBJCOPY} -O binary ${input} ${input}.bin.$$ 31 ;; 32*) 33 case $file in 34 *\ [Ff]ile\ [Ss]ystem*|*\ [Ff]ilesystem*) 35 overwrite=1 36 ;; 37 esac 38 cp ${input} ${input}.bin.$$ 39 ;; 40esac 41 42size=$(${STAT} -f '%z' ${input}.bin.$$) 43size=$(( ( $size + 511 ) / 512 )) 44 45enc() 46{ 47 local _x=$1; shift 48 printf $( printf '\\x%x' $_x ) 49} 50 51be32enc() 52{ 53 local _x=$1; shift 54 enc $(( ( $_x >> 24 ) & 0xff )) 55 enc $(( ( $_x >> 16 ) & 0xff )) 56 enc $(( ( $_x >> 8 ) & 0xff )) 57 enc $(( ( $_x >> 0 ) & 0xff )) 58} 59 60{ 61 be32enc $magic 62 be32enc $start 63 be32enc $size 64 be32enc 0 65 be32enc $start 66 be32enc 0 67 be32enc 0 68 be32enc 0 69} > ${input}.hdr.$$ 70 71if [ $overwrite = 0 ]; then 72 cat ${input}.hdr.$$ ${input}.bin.$$ > ${output} 73else 74 cp ${input}.bin.$$ ${output} 75 dd if=${input}.hdr.$$ of=${output} conv=notrunc 76fi 77 78rm -f ${input}.hdr.$$ ${input}.bin.$$ 79exit 80