Alan Cox wrote:
Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing enabled
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
It's a Shuttle HOT-661 motherboard (VIA Apollo Pro Plus mainboard
chipset). Both FreeBSD and Linux identify the serial chipset type as
16550A.
So you've got 16bytes of buffering. That ought to be enough on a modern
PC. The older kernels use quite limited internal buffers which may be a
factor, the current ones have a rewritten tty buffering layer which may
improve matters enormously.
So, does this explain why I wouldn't have a problem at 115200 bps with
kernel 2.2.5 but why I do with 2.6.5 and 2.6.18? Both hardware and
software flow control work fine with 2.2.5 (meaning I don't see any
error message and I don't have any data corruption), but neither works
to avoid the "kernel: ttyS1: 1 input overrun(s)" and consequent data
corruption issue in 2.6.5 nor 2.6.18.
Was there some associated application change in tty handling that needed
to occur between the 2.2 and 2.6 kernels to properly implement flow control?
Thanks,
Lee.
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