Finally switch PSX16550 fast serial board driver to using MI com(4) driver.
Based on isaki@'s patch and debugged by both isaki@ and tsutsui@.
PSX16550 specific hardware infomation is taken from Huma
Finally switch PSX16550 fast serial board driver to using MI com(4) driver.
Based on isaki@'s patch and debugged by both isaki@ and tsutsui@.
PSX16550 specific hardware infomation is taken from Human68k's PSXIO driver:
http://retropc.net/x68000/software/hardware/psx16550/
XXX1: TL16C550C seems to have some timing critical issue around THRE interrupt
XXX2: auto hardware flow control of TL16C550 is not implemented in MI com(4)
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