Problem with sram size on OMAP1611 (OSK)
santosh.shilimkar at ti.com
Tue Dec 7 01:20:37 EST 2010
> -----Original Message-----
> From: Tony Lindgren [mailto:tony at atomide.com]
> Sent: Tuesday, December 07, 2010 5:49 AM
> To: Tim Bird
> Cc: santosh.shilimkar at ti.com; linux-arm-kernel at lists.infradead.org
> Subject: Re: Problem with sram size on OMAP1611 (OSK)
> * Tim Bird <tim.bird at am.sony.com> [101119 18:48]:
> > Santosh,
> > I just tried the latest kernel (well, v2.6.36), and found a problem
> > that bisected to the following commit:
> > commit e546f21b4b7af012d9f18edad6237339adfeb681
> > Author: Santosh Shilimkar <santosh.shilimkar at ti.com>
> > Date: Fri Sep 24 07:19:49 2010 +0100
> > ARM: 6408/1: omap: Map only available sram memory
> > I am testing Linux on an OSK board (with an OMAP1611),
> > and the above commmit causes the machine to hang.
> > I isolated the problem to the sram length. The commit
> > above changes it to a value detected in omap_detect_sram(),
> > but when this value is used, my OSK hangs on boot.
> > Below is the hack I used to work around this. I'm not sure
> > what the problem is, but I'd be happy to provide more information
> > or try other things, to fix support for omap1611 in mainline.
> > I tried putting the 1024 * 1024 value into omap_detect_sram(),
> > with no luck. There's some additional processing there which
> > might alter the value. Or perhaps the current value there
> > for omap_sram_size on a 1611 is just wrong.
> > diff --git a/arch/arm/plat-omap/sram.c b/arch/arm/plat-omap/sram.c
> > index 10b3b4c..d4ba4fa 100644
> > --- a/arch/arm/plat-omap/sram.c
> > +++ b/arch/arm/plat-omap/sram.c
> > @@ -236,6 +236,8 @@ void __init omap_map_sram(void)
> > base = ROUND_DOWN(base, PAGE_SIZE);
> > omap_sram_io_desc.pfn = __phys_to_pfn(base);
> > omap_sram_io_desc.length = ROUND_DOWN(omap_sram_size,
> > + if (cpu_is_omap1611())
> > + omap_sram_io_desc.length = 1024 * 1024;
> > iotable_init(omap_sram_io_desc,
> > printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size:
> I'm not seeing this on my OSK, can you please check if this still
> happening with v2.6.37-rc4?
Any updates Tim ??
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