ZuluSCSI GD32 V1.1: Fix PhyMode=2 (DMA_TIMER) with AHA2940UW #254
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On V1.1, PhyMode 2 could terminate transfer before last ack from host was received. In practice this happened if host waited more than 2 µs after the last REQ. This resulted in watchdog timeouts in the logs. This has occurred in particular with AHA2940UW, where the SCSI MESSAGE_IN phase has up to 18 µs delay from the host.
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On V1.1, PhyMode 2 could terminate transfer before last ack from host was received. In practice this happened if host waited more than 2 µs after the last REQ. This resulted in watchdog timeouts in the logs.
This has occurred in particular with AHA2940UW, where the SCSI MESSAGE_IN phase has up to 18 µs delay from the host.