Hello all, I'm developing a driver for an embedded ARM system (2.6.24 system) and have 128M of RAM which I have been given free reign over. I want to carve out an 8M block of RAM for use by this driver and mmap() it into user space for transferring data from the driver to userspace.
I have the driver working with 8k of RAM, simply using kmalloc(). My efforts to scale up to 8M have failed. 1) kmalloc() won't work at 8M 2) get_free_pages() doesn't work -- says it can't fulfill a request of the necessary order 3) I tried ioremap() -- didn't work 4) kmap() -- didn't work 5) vmalloc() -- didn't work Obviously, I'm a newbie at this and was hoping to just get lucky, but now I need some advice on which one of the above 5 approaches (or any other approaches) I should spend my time on, and which ones of the above are hopeless. I already read through the relevant chapters of LDD3, which is how I got the above pointers. I'm also free to boot the kernel with MEM= or RESERVE= or whatever kernel parameters I need (I tried MEM= with the above approaches to no avail). Thanks for any and all advice... -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
