13 Jun
2011
13 Jun
'11
11:35 p.m.
On Fri, Jun 10, 2011 at 8:20 AM, Jay Estabrook jay.estabrook@gmail.com wrote:
Alpha needs to have the system bus address for the device's local memory available, so that it can be returned to user-level, where it may be used in an mmap(). So, we make bus.addr hold the ioremap() return for kernel use, and then we can modify bus.base appropriately.
I don't get this. why is mmap passing in an address? we don't do that anymore.
When you mmap the device node it passes back a hashed offset in the table, that the kernel then translates into a proper address and sets up the page tables.
So I really don't get what this patch is doing, either the explaination of what it is doing is wrong or it is wrong.
Dave.