Re: problem on MPC8xx

Hi Jason:

Which CPM port do you need to use, I have modified the kernel for our custom
board to support serial consoles on all the SMC's and SCC's.  The
ramdisk.image.gz of mbx is probably aimed at SMC1 or ttyS0, you will
probably just want to make your own from a slightly modified minroot.

I just use SMC1 as my console port. I show you all messages from
log_buf:

<4>Linux version 2.2.13 (tliu@Saxophone)
 (gcc version egcs-2.91.66 19990314
 (egcs-1.1.2 release))
  #166 Mon Feb 28 20:55:48 GMT+82000.
<4>Boot arguments: root=/dev/ram.
<4>time_init: decrementer frequency = 240000000/60.
<4>Calibrating delay loop... 63.69 BogoMIPS.
<4>Memory: 13412k available
 (640k kernel code, 412k data, 32k init) [c0000000,c1000000].
<4>DENTRY hash table entries: 262144 (order: 9, 2097152 bytes).
<4>Buffer-cache hash table entries: 32768 (order: 5, 131072 bytes).
<4>Page-cache hash table entries: 4096 (order: 2, 16384 bytes).
<4>POSIX conformance testing by UNIFIX.
<6>Linux NET4.0 for Linux 2.2.
<6>Based upon Swansea University Computer Society NET3.039.
<6>NET4: Unix domain sockets 1.0 for Linux NET4.0..
<6>NET4: Linux TCP/IP 1.0 for NET4.0.
<6>IP Protocols: ICMP, UDP, TCP, IGMP.
<4>TCP: Hash tables configured (ehash 16384 bhash 16384).
<4>Starting kswapd v 1.5 .
<6>CPM UART driver version 0.02.
<6>ttyS00 at 0x0280 is a SMC.
<6>ttyS01 at 0x0100 is a SCC.
<6>ttyS02 at 0x0200 is a SCC.
<4>RAM disk driver initialized:  16 RAM disks of 4096K size.
<4>eth0: CPM ENET Version 0.2, 00:00:00:00:00:00.
<5>RAMDISK: Compressed image found at block 0.
<4>VFS: Mounted root (ext2 filesystem)..
<4>Freeing unused kernel memory: 32k .
<4>rs_open ttyS0, count= 1.
<4>starting up ttys0 (irq 4)
...rs_open ttys0 successful.....

Methods of testing, sure whether or not characters are coming out of the
serial port.

I mean that what I should write to test it. eg. printf() or write() or
etc.

Most likely you will need to modify m8xx_tty.c and not uart.c, from what I

I have modified m8xx_tty.c successfully, but you know, that's not the
true serial driver. I can see the following on serial port:

loaded at:     00200000 0020B1BC
board data at: 0020013C 00200158
relocated to:  001F0100 001F011C
zimage at:     002301B4 002873CC
initrd at:     002873CC 0045E209
avail ram:     0045F000 00FFFFFF

Linux/PPC load:
Uncompressing Linux...done.
Now booting the kernel

But after the Linux boot up, I can't see anything.

remember uart.c works just fine but you have to have the /dev/console link
correct.  Let me know which port you want to use and I will look into it.

I don't hope to modify uart.c too.
I am using SMC1 to be serial port.

Thanks for your help!

LiuTao

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