Messages in this thread | | | From | jmcmullan@linuxcar ... | Subject | Re: SmartMedia translation layer? | Date | 27 Jul 2000 23:05:56 GMT |
| |
Matthew Dharm <mdharm-kernel@one-eyed-alien.net> wrote: > However, the usb-storage development team is working on implementing > support for a USB SmartMedia reader/writer. To do this, we need to have > code which can take care of this re-mapping system. We're wondering if > anyone out there has such code allready (perhaps even in use with Linux).
Not and have it architecturally independant. IIRC, ioremap() of a PCI memory region must be used on all architectures, and simply dereferencing the pointer to that memory won't work on many architectures - with the *notable* exception of x86.
I would recommend creating a block device, where each block corresponds to a flash memory segment. Then, in your block handler, use the readl()/writel() IO macros to access the remapped PCI region and thanser data to the blocks request.
Simple, easy, and would allow the mounting of a FAT filesystem on the SmartMedia...
IIRC, there should be hooks in the block layer to allow you to do control the re-ordering of blocks to minimize the number of write cycles.
-- Jason McMullan, Senior Linux Consultant, Linuxcare, Inc. 412.422.8077 tel, 412.656.3519 cell, 415.701.0792 fax jmcmullan@linuxcare.com, http://www.linuxcare.com/ Linuxcare. Support for the revolution.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |