Hello, I am using a nano booted with the sd card image. I am trying to change the EMC frequency using the commands
$ echo <emc_freq> > /sys/kernel/debug/clk/override.emc/clk_update_rate
$ echo 1 > /sys/kernel/debug/clk/override.emc/clk_state
However i am only able to change the frequency from the min frequency (204000000) to the max (1600000000) and vice versa. Are there any frequencies in this range that I can also use? I am verifying the results using jetson_clocks --show.
for Nano , you can see the supported freq in the /sys/kernel/debug/clk/emc/possible_rates
I think only 2 freq are supported. [tegra210-porg-p3448-emc-a00.dtsi]
while TX1 will have many supported
it appears to me that /sys/kernel/debug/clk/emc/possible_rates does not exist.
root@nano0:~# cd /sys/kernel/debug/clk/emc
root@nano0:/sys/kernel/debug/clk/emc# ls
clk_accuracy clk_flags clk_parent clk_possible_parents clk_rate clk_update_rate frequency_stats_table pto_rate
clk_enable_count clk_notifier_count clk_phase clk_prepare_count clk_state dvfs_freq_offs pto_cycles
i am not sure what tegra210-porg-p3448-emc-a00.dtsi is referring to, where can i take a look at it?
Also, is the number of supported EMC frequencies something that can be changed by manually flashing L4T, rather than using the given sd card image?
Thanks
you can check frequency_stats_table .
Nano only supports two emc freq, 1600 is max value. In between is not allowed even if you flashed manually.
we share the kernel source and device tree files for the jetsons online. this file contains support emc freq for nano
What is the need for more emc freq?
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