early_serial_setup is broken in the 2.5 series

early_serial_setup is broken in the 2.5 series

[Brian Murphy]

As far as I can see early_serial_setup should be capable of being
used to dynamically setup a serial port at any time in the boot
process - this is certainly the case in the 2.4 kernels.

However if it is used during architecture initialization, for example,
then the serial8250_reg uart driver has not been registered and
initialized even though it is used in the early_serial_setup call.

What was wrong with the 2.4 implimentation where the registered
serial ports were saved until the serial driver was ready to use them?

/Brian

Re: early_serial_setup is broken in the 2.5 series

[Russell King]

On Sun, Dec 15, 2002 at 03:30:52PM +0100, Brian Murphy wrote:
> As far as I can see early_serial_setup should be capable of being
> used to dynamically setup a serial port at any time in the boot
> process - this is certainly the case in the 2.4 kernels.
> 
> However if it is used during architecture initialization, for example,
> then the serial8250_reg uart driver has not been registered and
> initialized even though it is used in the early_serial_setup call.
> 
> What was wrong with the 2.4 implimentation where the registered
> serial ports were saved until the serial driver was ready to use them?

Its broken at present.  Last I heard, Khalid is working on a fix (since
he has the hardware to be able to test it, its sensible that I wait
until he has a fix.)

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html