Dear Sergey Yanovich,
Dear Marek Vasut,
On Tue, 2013-05-21 at 12:39 +0200, Marek Vasut wrote:
2.2.5.2 of Marvell PXA27x Processor Family Developers Manual says: "The PXA27x processor cache configuration is identical to that of the PXA255 processor."
As a result, it is perfectly legitimate to use PXA25X 'lock_cache_for_stack' on PXA27X as well.
Why would you need this on PXA27x ? Is SRAM not enough?
SRAM is battery-backup.
SRAM is just the in-CPU bit of fast RAM. What do you mean by "battery-backup" ?
It can be used as a ultra-fast persistent storage in OS. Wasting a quater of it just to boot the system isn't the best choice.
The SRAM is used for stack in U-Boot until you leave board_init_f, then the stack is relocated to DRAM. The OS can use SRAM as needed, U-Boot is no longer operational once you load subsequent OS. What's the problem?
Best regards, Marek Vasut