In message 20040407112143.80715.qmail@web15201.mail.bjs.yahoo.com you wrote:
I had a trouble on coding a custom keyboard driver on my custom 8xx board in u-boot.According to README,only RBC823 does have a custom keyboard so far.I looked up
This is wrong.
Many systems have a custom keyboard of one kind or another. See for example LWMON and R360 and TRAB, which allow to bind arbitrary command sequences to arbitrary key combinations.
Or see HMI-10 which uses a custom PS/2 multiplexor to attach a standard PC keuyboard as input device.
kbd.c of this board but still some puzzles.In kbd.c, RBC823 use SMC1 as serial port to get the input,while I mean to implement the input by PCMCIA pins as GPIO.I could make a Level 0 interrupt by PCMCIA status change to create a character.But how about next step?
What are you going to use the "keyboard" for? To detect single key presses and to switch functions in U-Boot, like truning on/off of log ,messages, booting a different image and the like? Or as input device for interactive use?
- RBC823 use DPRAM as keyboard buffer and get
...
- How come RBC823 uses lcd_disable function and a
special U-BUS arbitration priority? I did the same on
...
- Also,when I registered my custom board as RBC823
did.I found the I/O address of keyboard and LCD had
It makes little sense to use a configuration for one board on completely different hardware. You need a detailed understanding of that hardware, and of your own, and in nearly all cases you will have to adapt the code. Simpy copying a configuration is a pretty good guarantee to run you into problems.
Best regards,
Wolfgang Denk