NVM Non-volatile Memory access compent (API)

yantai · 05-08-2007, 07:03 AM

Is there any package that provides APIs for the developer/user to write their file/data to Non-volatile Memory such as flash? Basically, I want parts of my file system running on RAM while for those data which requires high security/needs to keep, I want to write them into flash. How would I be able to do these in my program?

osor · 05-09-2007, 05:22 PM

Are you using linux? Generally, a device driver takes care of making whatever hardware you are using appear as a block device or similar. From there, you just use open() and read()/write() (or whatever other I/O you prefer). If you’re talking about the system’s CMOS ram (which it doesn’t look like), use the kernel nvram driver to create the block device /dev/nvram.

yantai · 05-11-2007, 05:24 AM

Yes, it is in linux. I mount the flash as a read-only filesystem (squashfs). But I want to do write() operation in order to save some data on to the flash. And it doesn't seem that write() will function on a read-only filesystem. How could I walk around this?

osor · 05-11-2007, 02:17 PM

Uhh… use a read/write filesystem? Am I missing something here?