[9fans] nvram

[Sergey Reva <rs_rlab@mail.ru>]

Hello Fans

At least in this weekend I got time to finish nvram emulation for x86.
It's 32k i2c EEPROM which concected to LPT port, of course others ic's supported too.
For now it powered from pc power supply, but i believe it can work
from LPT power too... checking now...

For testing device I read plan9.ini manual and set nvr=/dev/i2c
at this moment i can't find any way to access device driver instead of write
     char nvr[]="#2";
     bind(nvr,dev,MAFTER);
to port/initcode.c
in this case I fail with
.... can't write key to nvram: i/o error...

Then I try greping sources with 'write key to nvram', and find
/sys/src/libauthsrv/readnvram.c
after I walk though it i find many interesting, like this
nvram, nvroff, nvrlen. Then I put settings to plan9.ini
       nvram=/dev/i2c
       nvroff=0        #as i understand this is offset in file? right?
       nvrlen=512
after that all work fine

but, also I try
  cat '#2!/i2c'
and it's work, but when i write this to nvram i fail with
...file does not exist '''#2!/i2c'''....

Now I ask how use this device without changing initcode.c?
-- 
http://rs-rlab.narod.ru                          mailto:rs_rlab@mail.ru