Hi TI forum members, I'm trying for several days now to configure the DSP (under IPNC Appro 8147) to run at a higher clock rate but in vain.
I've followed at least 10 different threads that converged into changing /ti_tools/ipnc_psp_04_04_00_01/u-boot/arch/arm/include/asm/arch-ti81xx/clocks_ti814x.h and I made sure /ti_tools/ipnc_psp_04_04_00_01/u-boot/board/ti/ti8148/evm.c (also noticed /ti_tools/ipnc_psp_04_04_00_01/u-boot/board/ti/ti8148_ipnc/evm.c) is properly build (even tried full system rebuild) but when i measure the DSP performance with some external clock (A8 or a physical hand timer) nothing is actually changed...
I opened this thread because I noticed 2 troubling messages while the system is booting:
U-Boot 2010.06 (Jun 13 2013 - 21:18:43) DM8127_IPNC_3.00.00
TI8148-GP rev 2.1
ARM clk: 600MHz
DDR clk: 400MHz
L3 clk: 200MHz
IVA clk: 450MHz
ISS clk: 400MHz
DSP Default OFF
DSS Default OFF
I2C: ready
DRAM: 512 MiB
NAND: HW ECC BCH8 Selected
256 MiB
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[Q1] How come I don't see the DSP real clock if it's being setup in uboot? Can it be that I need to modify some parameters in my uboot so it will actually change the DSP clock?
Then, when the system is up (bios6-wise), I can see this strange message:
[c6xdsp ] ***** SYSTEM : Frequency <ORG> - 500000000, <NEW> - 750000000
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
I know that this comes from BIOS_getCpuFreq but I can't find the source for it (seems to be in the closed bios6 libraries). I know this is very peculiar as I already modified ipnc_rdk/ipnc_mcfw/mcfw/interfaces/link_api/system_common.h to be
#define SYSTEM_DSP_FREQ (750*1000*1000)
so the function takes its "info" from a direct PLL or upon setup time, maybe it's the ones that actually set my clock frequency and not uboot...
[Q2] How does BIOS_getCpuFreq derive the DSP clock frequency and how can i actually change it if not from uboot?
This frequency boost is highly critical for my project so I must understand how to make it work.
Please advise,
Regards,
Roei