Re: Serial port numbering (ttyS..) wrong for 2.5.61+

From: Paul Rolland (
Date: Sun Jun 01 2003 - 07:48:14 EST


> Since I tried the 2.5 kernel versions somewhere in the 2.5.6x range, I
> see rather odd port naming for the extra 4 serial ports on a PCI-card.
Which driver are you using ?

> The first two are numered as ttyS14, ttyS15 while the last two are
> ttyS2 and ttyS3 !
> I tried to find where these numbers are coming from but
> couldn't really
> find an obvious place in the various drivers/char/* or
> drivers/serial/*
> files.

Numbering seems to be coming out of
drivers/serial/core.c : uart_find_match_or_unused
which is responsible for finding an unused state for the port.

However, the code there seems to be clean and I guess we should look
where the state are initialized.


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