[PATCH] OMAP3: run the ASM sleep code from DDR

[Paul Walmsley]

On Tue, 12 Jul 2011, Pavel Machek wrote:

> On Wed 2011-06-29 18:40:23, jean.pihet at newoldbits.com wrote:
> > From: Jean Pihet <j-pihet at ti.com>
> > 
> > Most of the ASM sleep code (in arch/arm/mach-omap2/sleep34xx.S)
> > is copied to internal SRAM at boot and after wake-up from CORE OFF mode.
> > However only a small part of the code really needs to run from internal SRAM.
> > 
> > This fix lets most of the ASM idle code run from the DDR
> > in order to minimize the SRAM usage and the overhead in the code copy.
> 
> So... what do you plan to use sram for? Because I don't think the
> speedup is worth the complexity...

The SDRAM may not be accessible yet when the chip isn't waking up from 
off-mode, so SRAM is the only option.  The comments & code in the patch 
surrounding the "wait_sdrc_ok" label refer to this issue - albeit, perhaps 
telegraphically.


- Paul