diff options
Diffstat (limited to 'src/util/makerom.pl')
| -rwxr-xr-x | src/util/makerom.pl | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/src/util/makerom.pl b/src/util/makerom.pl index aed3a569..68c3be98 100755 --- a/src/util/makerom.pl +++ b/src/util/makerom.pl @@ -130,14 +130,14 @@ sub writerom ($$) { close(R); } -sub checksum ($) { - my ($romref) = @_; +sub checksum ($$) { + my ($romref, $romsize) = @_; substr($$romref, 6, 1) = "\x00"; - my $sum = unpack('%8C*', $$romref); + my $sum = unpack('%8C*', substr($$romref, 0, $romsize)); substr($$romref, 6, 1) = chr(256 - $sum); # Double check - $sum = unpack('%8C*', $$romref); + $sum = unpack('%8C*', substr($$romref, 0, $romsize)); if ($sum != 0) { print "Checksum fails\n" } elsif ($opts{'v'}) { @@ -146,10 +146,10 @@ sub checksum ($) { } sub makerom () { - my ($rom, $romsize); + my ($rom, $romsize, $stubsize); - getopts('3xi:p:s:v', \%opts); - $ARGV[0] or die "Usage: $0 [-s romsize] [-i ident] [-p vendorid,deviceid] [-x] [-3] rom-file\n"; + getopts('3xni:p:s:v', \%opts); + $ARGV[0] or die "Usage: $0 [-s romsize] [-i ident] [-p vendorid,deviceid] [-n] [-x] [-3] rom-file\n"; open(R, $ARGV[0]) or die "$ARGV[0]: $!\n"; # Read in the whole ROM in one gulp my $filesize = read(R, $rom, MAXROMSIZE+1); @@ -183,10 +183,16 @@ sub makerom () { } # Pad with 0xFF to $romsize $rom .= "\xFF" x ($romsize - length($rom)); - if ($romsize >= 128 * 1024) { - print "Warning: ROM size exceeds extension BIOS limit\n"; + # If this is a stub ROM, don't force header size to the full amount + if (!$opts{'n'}) { + if ($romsize >= 128 * 1024) { + print "Warning: ROM size exceeds extension BIOS limit\n"; + } + substr($rom, 2, 1) = chr(($romsize / 512) % 256); + } else { + $stubsize = ord(substr($rom, 2, 1)) * 512; + print "Stub size is $stubsize\n" if $opts{'v'}; } - substr($rom, 2, 1) = chr(($romsize / 512) % 256); print "ROM size is $romsize\n" if $opts{'v'}; # set the product string only if we don't have one yet my $pnp_hdr_offset = unpack('v', substr($rom, PNP_PTR_LOC, 2)); @@ -196,7 +202,7 @@ sub makerom () { # 3c503 requires last two bytes to be 0x80 substr($rom, MINROMSIZE-2, 2) = "\x80\x80" if ($opts{'3'} and $romsize == MINROMSIZE); - checksum(\$rom); + checksum(\$rom, $opts{'n'} ? $stubsize : $romsize); writerom($ARGV[0], \$rom); } @@ -213,7 +219,7 @@ sub modrom () { print "$filesize bytes read\n" if $opts{'v'}; pcipnpheaders(\$rom, undef); undiheaders(\$rom); - checksum(\$rom); + checksum(\$rom, ord(substr($rom, 2, 1)) * 512); writerom($ARGV[0], \$rom); } |