On Tue, Mar 31, 2009 at 4:09 PM, Jean-Christophe PLAGNIOL-VILLARD wrote:
if you want to use the dcache you must first correctly setup the MMU and
the TLB
I set-up : 1) pagetable in the SDRAM (one master pagetable, to map all 4096 pages of address space to map from the virtual to the same addresses in physical address) 2) I use client domain 3 3) set up all permissions to RW 4) attached pagetable (put info about master table address into CP15 reg)
When I try to switch MMU on after all of this (in CP15 reg), u-boot blocks.
I created one command to do all this init, and in the end write into CP15 reg to switch on MMU. Is this approach OK? but for some reason, u-boot blocks there, right after switching MMU on.
I am sure that MMU works, because I can boot Linux on the same board, and Linux works.
With JTAG I can see that pagetable is written on SDRAM on given address, so I suspect on permissions, but from each pagetable entry I have that domain and access permissions as I said (domain 3 client, RW).
Do you have any idea what can be wrong and where to look?
Best regards, Drasko