On Mon, 12 Mar 2012, jonsm...@gmail.com wrote:
> On Mon, Mar 12, 2012 at 4:18 PM, Nicolas Pitre <nicolas.pi...@linaro.org>
> wrote:
> > On Mon, 12 Mar 2012, jonsm...@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
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