- unlock SRAM for GP devices.
AFAIK, GP devices are configured at chip level, means, it depends on what chip I had received. _or_ will it be possible to to configure EVM for to access full SRAM?
For the device types you may use (GP/HS/EMU) all but a small portion of the SRAM comes up in a locked mode for an external boot. A GP device can directly hit HW firewall registers to open it all up. For internal boot using a signed image the secure mask ROM code will unlock SRAM for the ARM11, but not other initiators (DSP/IVA/...). To get SRAM in this mode you need to make a call into secure mode to affect the HW firewall registers. There are a couple ways to get code to run in secure mode, but require some specific procedures.
As per our obeservations codecs like software had significant performance running in IVA when access to SDRAM from ARM11 is less...meaning let's put part of continously running Linux code in SRAM and reduce SDRAM contention.
This may be true. The SDRAM is a shared resource. I would think making sure priorities are mapped correctly to the SMS at the initiator level would mitigate this. ES2 has several fix ups to defaults which should make performance better across the board. The next 24xx has further fixes to increase performance.
Regards, Richard W.