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