Eli Brin wrote:

Hello,

I have noticed, in kernel 2.4.20, that SCC1 and SCC4 cannot be configured as
uarts.

Also, the configuration for RTS,CTS,DCD and DTR are missing.

Comparing 8xx_io/uart.c file to the 2.4.4 version of uart.c shows that all
the code to support the above has been removed, although both show driver
0.3.

Our target will use all SCC's as uarts with hardware handshake. So I will
need to put this back into uart.c and the config.in files.

Is there a reason for this feature (SCC1 and SCC4 as uarts are part of the
8xx ability) being removed ?

They haven't been removed! This feature just never made it into the
official BitKeeper tree.

Have a look at linuxppc_2_4_devel in the DENX CVS. Especialy between
the labels LABEL_2003_03_11_2045 and LABEL_2003_03_11_2055!

BTW: Make sure you understood the "hardware handshake" done by the
MPC8xx! MPC8xx CTS/RTS have a different meaning than you might expect
when dealing with real UARTS! Basicly the only support flow control in
one direction! So a device can throttle the MPC. But the MPC can _not_
stop the device from sending more!

Hope this helps.

Steven


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