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DM814x fetching hardware information: memory working frequency

Alessandro Russo

Prodigy 160 points

Other Parts Discussed in Thread: TMS320DM8148

I would like to fetch several hardware information about CPU, Memory, Network and more. The operating system is the Ubuntu SoC that comes with TI using RDK1.0 rc3 and ezsdk_5_03_01_15 based on kernel 2.6.37.

I've installed the lshw and hwinfo packages which provide several information on the hardware, however, I was not able to find some specific information, in particular the Memory Frequency, for instance whether it is 400MHz or 533MHz. Such frequency value is set by u-boot and it seems that the devmem2 can be used to read the memory value which contains the memory frequency (PLL right?).
Do you have any utility/document that explains how to fetch such specific information ?

Thank you and best regards,
Alessandro Russo

over 11 years ago

0 Margarita Gashova over 11 years ago

TI__Guru* 80190 points

Hello,

Try:

# mount -t debugfs debugfs /sys/kernel/debug

# cat /sys/kernel/debug/clock/osc0_clkin_ck/arm_dpll_clkin_ck/arm_dpll_ck/rate

# cat /sys/kernel/debug/clock/osc0_clkin_ck/dsp_dpll_ck/rate

# cat /sys/kernel/debug/clock/osc0_clkin_ck/ddr_dpll_clkin_ck/ddr_dpll_ck/rate

# cat /sys/kernel/debug/clock/osc0_clkin_ck/iss_dpll_ck/rate

# cat /sys/kernel/debug/clock/osc0_clkin_ck/hdvicp_dpll_ck/rate

# cat /sys/kernel/debug/clock/osc0_clkin_ck/l3_dpll_clkin_ck/l3_dpll_ck/rate

# cat /sys/kernel/debug/clock/osc0_clkin_ck/hdvpss_dpll_ck/rate

Best Regards,

Margarita

0 Alessandro Russo over 11 years ago in reply to Margarita Gashova

Prodigy 160 points

Dear Margarita,

it works! thank you!

Regards,

Alessandro

0 Pavel Botev over 11 years ago in reply to Alessandro Russo

TI__Guru**** 170625 points

Alessandro,

For full information about the TI81xx clock framework, see the below user guide:

http://processors.wiki.ti.com/index.php/TI81XX_PSP_PM_CLOCK_FRAMEWORK_User_Guide

Regards,
Pavel

0 Alessandro Russo over 11 years ago in reply to Pavel Botev

Prodigy 160 points

Dear Pavel,

thank you! Actually, I found[1] for default clock configuration and [2] rate values for different OPP.

Can I use such values as a reference even for older version if PSP?

Regards,

Alessandro

[1] http://processors.wiki.ti.com/index.php/TI81XX_PSP_04.04.00.02_Feature_Performance_Guide#TI814X

[2] http://www.ti.com/lit/gpn/tms320dm8148 page: 183 Table 7.4

0 Margarita Gashova over 11 years ago in reply to Alessandro Russo

TI__Guru* 80190 points

Hello,

It seems they are the same.

Here is for your PSP version:

http://processors.wiki.ti.com/index.php/DM814x_AM387x_PSP_04.01.00.06_Feature_Performance_Guide#PG_2.0

http://processors.wiki.ti.com/index.php/TI81XX_PSP_04.04.00.02_Feature_Performance_Guide#TI814X

Best Regards,

Margarita

0 Alessandro Russo over 11 years ago in reply to Margarita Gashova

Prodigy 160 points

Dear Margarita,

thank you for the useful information.

One more question, how can I change the DDR clock ? can I change it dynamically?

Best Regards,

Alessandro

0 Margarita Gashova over 11 years ago in reply to Alessandro Russo

TI__Guru* 80190 points

Hello Alessandro,

Check this e2e forum thread:

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/327038/1141207.aspx

Here Pavel Botev provided detailed information.

Best Regards,

Margarita

0 Alessandro Russo over 11 years ago in reply to Margarita Gashova

Prodigy 160 points

Dear Margarita,

thank you for the link. Thus, the clock can be set only through u-boot.

However, it seems that devmem2 can be used, as well. For instance, reading/setting DDR_CLKCTRL 0x801

Is it actually feasible?

Best Regards,

Alessandro