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Added work-around for the Atari Daynaport driver (#665)

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Uwe Seimet 2022-02-16 03:13:22 +01:00 committed by GitHub
parent b3bdd07fa7
commit 511c55a720
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1 changed files with 12 additions and 3 deletions
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15
src/raspberrypi/devices/scsi_daynaport.cpp
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@ -241,8 +241,17 @@ int SCSIDaynaPort::Read(const DWORD *cdb, BYTE *buf, uint64_t block)
// } else {
// response->flags = e_no_more_data;
// }
buf[0] = (BYTE)((rx_packet_size >> 8) & 0xFF);
buf[1] = (BYTE)(rx_packet_size & 0xFF);
int size = rx_packet_size;
if (size < 64) {
// A frame must have at least 64 bytes (see https://github.com/akuker/RASCSI/issues/619)
// Note that this work-around breaks the checksum. As currently there are no known drivers
// that care for the checksum, and the Daynaport driver for the Atari expects frames of
// 64 bytes it was decided to accept the broken checksum. If a driver should pop up that
// breaks because of this, the work-around has to be re-evaluated.
size = 64;
}
buf[0] = size >> 8;
buf[1] = size;
buf[2] = 0;
buf[3] = 0;
@ -255,7 +264,7 @@ int SCSIDaynaPort::Read(const DWORD *cdb, BYTE *buf, uint64_t block)
// Return the packet size + 2 for the length + 4 for the flag field
// The CRC was already appended by the ctapdriver
return rx_packet_size + DAYNAPORT_READ_HEADER_SZ;
return size + DAYNAPORT_READ_HEADER_SZ;
}
// If we got to this point, there are still messages in the queue, so
// we should loop back and get the next one.