|To:||Gilad Rom <email@example.com>|
|Subject:||Re: CP0 EntryLo|
|From:||Pete Popov <firstname.lastname@example.org>|
|Date:||Tue, 30 Nov 2004 10:01:26 -0800|
|Cc:||"Maciej W. Rozycki" <email@example.com>, firstname.lastname@example.org|
|User-agent:||Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040913|
Maciej W. Rozycki wrote:
On Tue, 30 Nov 2004, Gilad Rom wrote:So, what I need to do, if I understand correctly, is to create a fixed mappingVirtual address to change the values of EntryLo to 0xD in order to Access the device on the address range I mapped Chip-select 1 to?From a virtual address to a physical address on the tlb, and use this(Excuse my poor phrasing, I've been googling all day...) Any idea on how I might accomplish that from a driver? I've found a function called add_wired_entry(...), is this What I should be using?ioremap()
Exactly. You program the CS with a physical address. Make sure that address does not overlap with anything else. Then you call ioremap from your driver and you get back a virtual address. You use that virtual address to access the peripheral.
At this stage I would say that probably reading something like the Linux Kernel book or Linux Device Drivers both by Oreilly will really help you.
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