I guess it has to be a disk in that I would like to have a file system on it and move files around on it -- basically I want to be able to treat it like a disk from a command line perspective.
I can access the nvram through a C program using open() and mmap(), but I would like to be level higher then that. Mike Wright, David wrote: > Does it have to be a disk? The Walnut has a similar setup to > what you are describing and allows you to define a device, > /dev/nvram, that functions as a disk-like object (you can > open it, seek it, read and write it). > > -- David Wright, InfiniSwitch Corp. > > > >>-----Original Message----- >>From: Mike Moleschi [mailto:moleschi at rmsweldingsystems.com] >>Sent: Tuesday, November 12, 2002 1:29 PM >>To: linuxppc-embedded at lists.linuxppc.org >>Subject: Accessing nvram rom the linux users space >> >> >> >>I am using a PPC board running a version of Hard Hat linux, and >>currently using version of the 2.4.20 kernel. On the board there >>are several places for storage: 32MB of SRAM, 4MB of flash-EPROM, >>32kB of NVRAM, and 16k-bit serial EEPROM. The SRAM, flash and NVRAM >>are memory mapped. The NVRAM is actually battery backed up RAM >>that includes a RTC in the last 8 bytes of addressed memory. Right >>now there is nothing stored in the NVRAM (PPC Boot is stored in >>part of the flash, and the PPC environment variable are in the >>serial EEPROM.) NVRAM is mapped from 0xF0200000 to 0xF0207FFF. >> >>I would like to be able to uses the NVRAM from the linux users >>space. Ideally it would just be an extention of my filesystem, >>where I could place one or two small files on it. This would >>let me store information that needs to be kept through a loss of >>power. >> >>So basically I think what I am trying to figure out, is how do I >>mount the NVRAM as a disk. >> >> >> >> >>-- >> >> >>Mike Moleschi >>moleschi at rmsweldingsystems.com >>RMS Welding Systems >>1409 - 4th Street, Nisku, Alberta CANADA T9E 7M9 >>Tel: (780)955-3907 Fax: (780)955-3996 >> >> > > > > -- Mike Moleschi moleschi at rmsweldingsystems.com RMS Welding Systems 1409 - 4th Street Nisku, Alberta CANADA T9E 7M9 Tel: (780)955-3907 Fax: (780)955-3996 ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
