For the record, this bug seems to be associated with 8250_pnp.
Under 2.6.24.2, if 8250_pnp is blacklisted and 8250_pci is explicity
loaded while booting, then /dev/ttyS{0,1,2,3} are created and accessing
ttyS0 and ttyS1 works.
Given the original nondetermination, I cannot be sure this is reliable,
but it has worked in every test so far.
I am not clear why 8250_pci does not get loaded automatically.
A Lawrence
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