On Mon, 12 Mar 2012, jonsmirl@gmail.com wrote:
On Mon, Mar 12, 2012 at 4:18 PM, Nicolas Pitre nicolas.pitre@linaro.org wrote:
On Mon, 12 Mar 2012, jonsmirl@gmail.com wrote:
I'm working on getting out of tree support for the NXP LPC31xx ARM926EJS based CPUs ready for submission. Everything was working fine on v3.2 but I lost the ability to boot with v3.3. The boot failure is very early in the boot process. I did a bisect and came up with:
[6ee723a6570a897208b76ab3e9a495e9106b2f8c] ARM: simplify __iounmap() when dealing with section based mapping
I tried to revert it but there have been a bunch of edits in this file. Not sure how to go about debugging this.
The first thing to look for is any overlap in the virtual memory ranges used in your struct map_desc array. No overlap is allowed anymore.
There appear to be overlaps. I'll have to study things for a while to figure out how to eliminate them. This is from a three year old NXP BSP. We have a product based on the CPU and want to use a more recent kernel.
They've defined multiple large peripheral regions...
/* APB4 address range*/ #define IO_APB4_PHYS (0x17000000) #define IO_APB4_SIZE (0x00001000)
{ .virtual = io_p2v(IO_APB4_PHYS), .pfn = __phys_to_pfn(IO_APB4_PHYS), .length = IO_APB4_SIZE, .type = MT_DEVICE },
and then declared various devices inside of them...
/* DMA registers address range*/ #define DMA_PHYS (0x17000000) #define IO_DMA_REG_PHYS (DMA_PHYS) #define IO_DMA_REG_SIZE (0x0000800)
{ .virtual = io_p2v(IO_DMA_REG_PHYS), .pfn = __phys_to_pfn(IO_DMA_REG_PHYS), .length = IO_DMA_REG_SIZE, .type = MT_DEVICE },
Just get rid of the map_desc entryes corresponding to subsets of a larger entry that already covers them and you should be fine.
Nicolas