We've been using the EZSDK for the 8148 for some time, along with the 8148 EVM boards (both PG1.0 and 2.1 revisions).Our design is using the fastest 8148 part (1000Mhz ARM, 750Mhz DSP). We notice that when U-Boot loads it indicates the ARM is running at 600Mhz. Is this supposed to be the speed that the Cortex A8 is running at? Is that correct? That is to say, when I looked into the underlying U-Boot code that prints said message (in arch/arm/cpu/arm_cortexa8/ti81xx/sysinfo.c), it is using constants rather than actually interrogating on-chip registers to derive said information. Is it correct to say that the EZSDK U-Boot code actually programs the 8148 ARM core to run at 600Mhz, and that (if unchanged) our 8148 design will be running at 600Mhz too?Also, if we change the speed for the Cortex A8, what other units on the device will change speed?
Hi Joe,
The default for EZSDK is running at OPP100 which is 600MHz. Please follow the instruction in this post below to set it up to run at 1GHz:
http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/204555.aspx
BR,
Viet