Please help with the OMAP static mapping mess

[Shilimkar, Santosh]

On Tue, Oct 4, 2011 at 4:29 AM, Tony Lindgren <tony at atomide.com> wrote:
> * Nicolas Pitre <nico at fluxnic.net> [111003 15:05]:
>> On Mon, 3 Oct 2011, Nicolas Pitre wrote:
>>
>> > On Mon, 3 Oct 2011, Tony Lindgren wrote:
>> >
>> > > * Nicolas Pitre <nico at fluxnic.net> [111003 11:26]:
>> > > >
>> > > > Furthermore... there is also a static mapping for physical address
>> > > > 0x4e000000 using virtual address 0xff100000 which is already reserved
>> > > > for other purposes i.e. the consistent DMA area.  It is not immediately
>> > > > obvious where this comes from without being intimate with the OMAP code.
>> > > > Can this be fixed as well i.e. moved elsewhere please?
>> > >
>> > > This sounds like a bug somewhere. Which omap are you seeing this on?
>> >
>> > OMAP4430 on a Panda board.
>> >
>> > Here are the static mappings I'm seeing:
>> >
>> > phys = 0x44000000 virt = 0xf8000000 size = 0x100000
>> > phys = 0x4a000000 virt = 0xfc000000 size = 0x400000
>> > phys = 0x50000000 virt = 0xf9000000 size = 0x100000
>> > phys = 0x4c000000 virt = 0xfd100000 size = 0x100000
>> > phys = 0x4d000000 virt = 0xfe100000 size = 0x100000
>> > phys = 0x4e000000 virt = 0xff100000 size = 0x100000 <---
>> > phys = 0x48000000 virt = 0xfa000000 size = 0x400000
>> > phys = 0x54000000 virt = 0xfe800000 size = 0x800000
>>
>> It looks like this comes from OMAP44XX_DMM_VIRT.
>>
>> #define OMAP44XX_DMM_PHYS       OMAP44XX_DMM_BASE
>>                                                 /* 0x4e000000 --> 0xfd300000 */
>> #define OMAP44XX_DMM_VIRT       (OMAP44XX_DMM_PHYS + OMAP4_L3_PER_IO_OFFSET)
>> #define OMAP44XX_DMM_SIZE       SZ_1M
>>
>> The comment suggesting a mapping correspondance is obviously wrong. We have:
>>
>> #define OMAP44XX_DMM_BASE       0x4e000000
>> #define OMAP4_L3_PER_IO_OFFSET  0xb1100000
>>
>> Hence 0x4e000000 + 0xb1100000 = 0xff100000.
>
> Seem like it might cause some random patterns in tiler :)
> Santosh, can youp please check it?
>
This is already fixed Tony. You have pulled that patch.
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg55258.html

Regards
Santosh