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Re: [Qemu-devel] signrom.sh and MinGW

From: Sebastian Herbszt
Subject: Re: [Qemu-devel] signrom.sh and MinGW
Date: Sun, 2 Aug 2009 14:21:41 +0200

Filip Navara wrote:
 Sebastian Herbszt wrote:
v0.11.0-rc0-182-g28e738d/pc-bios/optionrom/signrom.sh multiboot.raw
v0.11.0-rc0-182-g28e738d/pc-bios/optionrom/signrom.sh: * 512 - 1 : syntax
error: operand expected (error token is "* 512 - 1 ")
make[1]: *** [multiboot.bin] Error 1
rm multiboot.raw multiboot.img multiboot.o
make: *** [romsubdir-optionrom] Error 2

pc-bios/optionrom/signrom.sh has

# find out the file size
x=`dd if="$1" bs=1 count=1 skip=2 2>/dev/null | od -t u1 -A n`
#size=`expr $x \* 512 - 1`
size=$(( $x * 512 - 1 ))

but it seems (at least my) MinGW doesn't include "dd".

I have already reported that on the mailing list earlier.
Workaround/fix is to download MSYS coreutils from the MinGW download

Thanks for the hint - got it working now.

On a closer look at the "od" tool, the use of "dd" seems redundant:

      -j, --skip-bytes=BYTES
      skip BYTES input bytes first

      -N, --read-bytes=BYTES
      limit dump to BYTES input bytes

"od -N 1 -j 2 -t u1 -A n multiboot.raw" seems to do the same job and "od" is 
pre-shipped on
MinGW/MSYS. But maybe "-j" and "-N" are not widely implemented. A possible 
alternative could
be the use of "head" and "cut".

In any case signrom.sh might check for the presence of tools used.

- Sebastian

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