MPC860(T) uart SCCs

MPC860(T) uart SCCs

[Gerhard TAEUBL]

Hallo!
Iwork with an custom board MPC860T kernel 2.4.5. I will use all 4 SCC as uart RS485/RS232. The problem is, that SCC1 and SCC2 works fine and SCC3 and SCC4 not:
I mapped SCC1 to BRG1 (ttyS0) SCC2 to BRG2 (ttyS1)....
SCC3 and SCC4 doesn't generate any interrupt. If I write in a loop something to Port ttyS2 for example the driver fills the buffer set the Ready bit in the bd, and nothing else happens, no output. When the wrap happens the Ready bit is still set, and the program hangs up. It looks like the SCC won't send any data.

sicr is set to 0x1b120900 so I think there is no fault.

anyone any ideas?

Thanks for help

Gerhard


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Re: MPC860(T) uart SCCs

[Wolfgang Denk]

Hi,

> Iwork with an custom board MPC860T kernel 2.4.5. I will use all 4 SCC as uart RS485/RS232. The problem is, that SCC1 and SCC2 works fine and SCC3 and SCC4 not:

See our kernel version on ftp://ftp.denx.de/pub/LinuxPPC/usr/src .
The uart driver included works on all 6 possible serial ports (2 x SMC,
4 x SCC) simultaneous, with support for hardware flow controll on all
4 SCC ports.

I've sent a patch for current kernel versions (2.4.10-pre?) to Tom Rini
several days ago. Don't know when it will make it into the official
source tree, if ever.

Wolfgang Denk


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Re: MPC860(T) uart SCCs

[Gerhard TAEUBL]

Thanks for info. Well in a quick and dirty manner the uart device driver now runs, but now nothing will work no SCC. I adapt the code that I set the ports manualy, also disable serial console and hardware flow. But perhaps I can find in that way my bug.

best regards
Gerhard

>>> Wolfgang Denk <wd@denx.de> 09/20/01 09:28 AM >>>

Hi,

> Iwork with an custom board MPC860T kernel 2.4.5. I will use all 4 SCC as uart RS485/RS232. The problem is, that SCC1 and SCC2 works fine and SCC3 and SCC4 not:

See our kernel version on ftp://ftp.denx.de/pub/LinuxPPC/usr/src .
The uart driver included works on all 6 possible serial ports (2 x SMC,
4 x SCC) simultaneous, with support for hardware flow controll on all
4 SCC ports.

I've sent a patch for current kernel versions (2.4.10-pre?) to Tom Rini
several days ago. Don't know when it will make it into the official
source tree, if ever.

Wolfgang Denk


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/