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| author | Jörg Hohensohn <hohensoh@rockbox.org> | 2004-11-24 00:11:18 +0000 |
|---|---|---|
| committer | Jörg Hohensohn <hohensoh@rockbox.org> | 2004-11-24 00:11:18 +0000 |
| commit | 6fa25709d17e7530a137d355e48c7ec2881fe73f (patch) | |
| tree | 89bcff6eccb4874d72a59ddbdf13421891037743 /flash/extract/extract.c | |
| parent | f05dec570289ef9ebd84deaba1e08d960eadabf9 (diff) | |
checksum calculation was wrong (must be the sum of unscrambled), thanks Jens
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5462 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'flash/extract/extract.c')
| -rw-r--r-- | flash/extract/extract.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/flash/extract/extract.c b/flash/extract/extract.c index 31e223a546..2a8a7b3ec7 100644 --- a/flash/extract/extract.c +++ b/flash/extract/extract.c @@ -113,7 +113,12 @@ int main(int argc, char* argv[]) // generate checksum for (i=0; i<uiSize; i++) - usChecksum += aImage[uiStart + i]; + { + UINT8 byte; + byte = aImage[uiStart + i]; + byte = ~((byte >> 1) | ((byte << 7) & 0x80)); /* poor man's ROR */ + usChecksum += byte; + } // make header Write32(aHeader + 2, usChecksum); // checksum in 5th and 6th byte |