SAMA5D27 clock speed

Discussion around products based on ARM Cortex-A5 core.

Moderator: nferre

sat123
Posts: 10
Joined: Tue May 28, 2019 8:33 pm

SAMA5D27 clock speed

Mon Jun 10, 2019 3:03 pm

Hello everyone !!

I am using sama5d27 sip that is my custom board , My board is booting fine but clock speed is very slow . I mean when I am typing on it it prints very slowly on my screen . Please anyone suggest me what is going wrong with me .

Thanks !!
blue_z
Location: USA
Posts: 2007
Joined: Thu Apr 19, 2007 10:15 pm

Re: SAMA5D27 clock speed

Tue Jun 11, 2019 3:07 am

sat123 wrote: ... clock speed is very slow . I mean when I am typing on it it prints very slowly on my screen .
That's a subjective (and vague) description.
Provide a qualitative description by using a (calibrated) oscilloscope or frequency counter.

Read and apply "How To Ask Questions The Smart Way" before posting again.

Regards
nferre
Site Admin
Posts: 208
Joined: Wed Feb 14, 2007 11:17 am

Re: SAMA5D27 clock speed

Wed Jun 12, 2019 2:21 pm

Hi,

You can give us some clues by printing the clock summary in debugfs:

## first, if not already mounted in your rootfs, mount the debugfs
# mount -t debugfs debugfs /sys/kernel/debug/

## then, print the summary:
# cat /sys/kernel/debug/clk/clk_summary
clock enable_cnt prepare_cnt rate accuracy phase
----------------------------------------------------------------------------------------
slow_rc_osc 0 0 32768 250000000 0
main_rc_osc 0 0 12000000 100000000 0
main_xtal 1 1 24000000 0 0
main_osc 1 1 24000000 0 0
mainck 2 2 24000000 0 0
utmick 2 2 480000000 0 0
sdmmc1_gclk 0 0 480000000 0 0

[..]

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