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Lee Forrest wrote:
>
> This is the serial driver source built into my debian
> kernel (2.4.19). It has functionalities specifically 
> created for the type of card I have. 

Is it one of these?
-----------------------------------------------------------
DZ11 Serial Support
CONFIG_DZ
  DZ11-family serial controllers for VAXstations, including 
  the DC7085,  M7814, and M7819.

Z85C30 Serial Support
CONFIG_ZS
  Zilog 85C350 serial communications controller 
  see <http://www.zilog.com/pdfs/serial/z85c30.pdf>

CONFIG_SERIAL_NONSTANDARD
  Say Y here if you have any non-standard serial boards -- boards
  which aren't supported using the standard "dumb" serial driver.
  This includes intelligent serial boards such as Cyclades,
  Digiboards, etc. These are usually used for systems that need many
  serial ports because they serve many terminals or dial-in
  connections. 

Support more than 4 serial ports
CONFIG_SERIAL_MANY_PORTS
  Say Y here if you have dumb serial boards other than the four
  standard COM 1/2/3/4 ports. This may happen if you have an AST
  FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
  via FTP (user: anonymous) from
  ftp://metalab.unc.edu/pub/Linux/docs/HOWTO/mini), or other custom
  serial port hardware which acts similar to standard serial port
  hardware. If you only use the standard COM 1/2/3/4 ports, you can
  say N here to save some memory. You can also say Y if you have an
  "intelligent" multiport card such as Cyclades, Digiboards, etc.

Support for sharing serial interrupts
CONFIG_SERIAL_SHARE_IRQ
  Some serial boards have hardware support which allows multiple dumb
  serial ports on the same board to share a single IRQ. To enable
  support for this in the serial driver, say Y here.

Auto detect IRQ on standard ports (unsafe)
CONFIG_SERIAL_DETECT_IRQ
  Say Y here if you want the kernel to try to guess which IRQ
  to use for your serial port.   This is considered unsafe; it 
  is far better to configure the IRQ in a boot script using the 
  setserial command.

Support special multiport boards
CONFIG_SERIAL_MULTIPORT
  Some multiport serial ports have special ports which are used to
  signal when there are any serial ports on the board which need
  servicing. Say Y here to enable the serial driver to take advantage
  of those special I/O ports.

SGI Zilog85C30 serial support
CONFIG_SGI_SERIAL
  If you want to use your SGI's built-in serial ports under Linux,
  answer Y.

Support the Bell Technologies HUB6 card
CONFIG_HUB6
  Say Y here to enable support in the dumb serial driver to support
  the HUB6 card.
----------------------------------------------------------------

Any of those can be added to the BL3 kernel.  Most (all?) of
those are already in bzimage.big.  Have you tried bzimage.big 
with the new setserial?

> On BL3 I created the file /dev/ttyS4 and made sure mode and
> permissions matched the ones on my debian.

It appears to me that you will need CONFIG_SERIAL_MANY_PORTS
in the kernel.  bzimage.big has that.

> Pretty sure I need the 5.05c driver.

Why?  Kernel 2.2.26 is only a couple of years old.
Is your hardware newer than that?

> How can I get a compiler on BL3? 

In a previous message, I listed the foundation packages
you need to install (from Slackware 4.0).

> I don't know how to use slack packages.

It's exactly the same as with BL3 packages.
You use the pkg command to install them.

> I think I should try to compile that serial driver into
> the big kernel. 

Which serial driver?  As far as I can see, all the serial
drivers are already in the big kernel.

Cheers,
Steven