Hi Hesham,
I don't have an answer for you, but you may be able to find some help or
example code on the raspberrypi.org forums.
A couple of examples:
http://www.raspberrypi.org/phpBB3/viewtopic.php?t=40183&p=336705
http://www.raspberrypi.org/phpBB3/viewtopic.php?t=40665&p=332205
I avoided the MMU setup on the raspberry pi BSP, because I knew that the
GPU based bootloader set up the memory for the ARM CPU. More info on the
whole boot process here:
http://elinux.org/RPi_Software
Another nice thing to have for work like this is a JTAG debugger setup.
I hope I can get an inexpensive setup for mine before I try to add any
more drivers.
The readme at the repository below has some good info on setting up JTAG
on the raspberry pi:
https://github.com/dwelch67/raspberrypi/tree/master/armjtag
Alan
On 8/22/2013 6:48 PM, Hesham Moustafa wrote:
Hey all,
I am working on Raspberry Pi BSP which has ARM1176JZF-S (ARMv6)
processor on it. Here is what I am doing that causes the processor to
halt:
At BSP startup, specifically in bsp_start_hook_0 function, I call
another function that :
1- Initialize first level page tables (sections) with READ/WRITE
permissions.
2- Invalidate TLB.
3- Enable MMU, Cache, Protection bits in control register.
Initialization is done correctly and the program reaches my
application (test case), which tries to update first level page table
entries to force another protection attributes for a memory region. At
this part, after, or before, modifying the page table entry, I try to
invalidate TLB but the program halts there. I disable MMU and Caches
during updating page tables and invalidating TLB.
When removing the function call that invalidates the TLB, the program
proceed to the end successfully.
Not sure why the processor halts when trying to invalidate the TLB "at
the second time". I hope someone can tell me the reason.
Regards,
Hesham
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