EPCS Filesystem

Altera_Forum · ‎02-28-2006

I don't think this has been done, but has anyone looked into getting a EPCS driver in uClinux for a filesysteM? I was thinking of doing this as it didn't seem too hard, but it would be my first attempt at driver work, so I thought I would get some feedback first. I have >4 Megs free on my EPCS device, and it would be cool if I could get a FS on it.

Altera_Forum · ‎03-01-2006

I didn't see the EPCS driver. too.

Maybe you can add it to driver/mtd/chips dir.

Altera_Forum · ‎03-01-2006

That''s what I was thinking. One thing that came to mind was Altera doesn't let you directly access the EPCS device without using their HAL calls. Is it still possible to make a kernel driver using these calls?

J

Altera_Forum · ‎03-01-2006

Hi jdhar,

> has anyone looked into getting a EPCS driver in uClinux for a filesysteM?

It has been on my todo list for a while ... and is quickly coming to a head.

> Altera doesn't let you directly access the EPCS device without using their

> HAL calls. Is it still possible to make a kernel driver using these calls?

It's possible ... but not necessary. u-boot has a fairly complete set of epcs access

routines you can use as a starting point.

I'm waiting for some hardware at the moment ... once it arrives I'll be able to

help with this effort. Right now, I don't have any boards with a large enough

device to be useful.

Regards,

--Scott

Altera_Forum · ‎03-01-2006

I would be willing to put some time into this, especially knowing that there are some people here who could help me out.

I was actually just looking at the src code for all the epcs routines, and they are in fact just SPI calls, which translate to IORD/IOWRs... so I was going to figure out how to get those in uclinux. I guess the simple way is just to use pointers since the address space is all available.

On a higher level, I figure taking a simple MTD device and stripping it down should be simple enough - especially since there much simpler write/erase algorithms involved with the EPCS (at least compared to CFI for eg.)

If you decide to get around to it quicker than I however, I do have plenty of boards available to test any drivers on.

Altera_Forum · ‎03-01-2006

You can also take the sources from

altera/kits/nios2/components/altera_avalon_epcs_flash_controller/sdk or HAL