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Use byte 6 for the checksum, rather than byte 5. (Byte 5 may be part of

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the jmp instruction).
This commit is contained in:
Michael Brown 2006-06-06 15:29:14 +00:00
parent 02df45352c
commit 8d0c5f3302
1 changed files with 6 additions and 10 deletions
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16
src/util/makerom.pl
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@ -131,9 +131,9 @@ sub writerom ($$) {
sub checksum ($) {
my ($romref) = @_;
substr($$romref, 5, 1) = "\x00";
substr($$romref, 6, 1) = "\x00";
my $sum = unpack('%8C*', $$romref);
substr($$romref, 5, 1) = chr(256 - $sum);
substr($$romref, 6, 1) = chr(256 - $sum);
# Double check
$sum = unpack('%8C*', $$romref);
if ($sum != 0) {
@ -168,14 +168,10 @@ sub makerom () {
$romsize = ($filesize + 511) & ~511
}
} else {
$romsize = getromsize(\$rom);
# 0 put there by *loader.S means makerom should pick the size
if ($romsize == 0) {
# Shrink romsize down to the smallest power of two that will do
for ($romsize = MAXROMSIZE;
$romsize > MINROMSIZE and $romsize >= 2*$filesize;
$romsize /= 2) { }
}
# Shrink romsize down to the smallest power of two that will do
for ($romsize = MAXROMSIZE;
$romsize > MINROMSIZE and $romsize >= 2*$filesize;
$romsize /= 2) { }
}
if ($filesize > $romsize) {
print STDERR "ROM size of $romsize not big enough for data, ";