Enable EBP(Early Boot Partition) in tx2

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hi, i’m a student studying kernel on tx2.

I found a CONFIG_EBP but i don’t know what it is and how can i enable this.
I’m optimizing kernel and reducing booting time so I want to know what it is and how to use it!

Have a nice day.

2

hello lcj3722,

please check Jetson TX2 Boot Flow,
please refer to Kernel Boot Time Optimization chapter to decrease kernel boot time.
thanks

3

hello JerryChang,

Thank you for your help.
I already checked it but I can’t find answer.

when i enable this option, tx2 doesn’t boot.

4

Hi,

Where have you studied about Config EBP?
Can you point to the Kconfig file from the upstream kernel code?

5

/JetPack_4.2_Linux_P3310/Linux_for_Tegra/sources/kernel/nvidia/arch/arm64

here

6

Please ignore that.
Its a work in progress.

7

I have a problem with the explanation found under the boot time optimization underhttps://docs.nvidia.com/jetson/archives/l4t-archived/l4t-321/index.html#page/Tegra%2520Linux%2520Driver%2520Package%2520Development%2520Guide%2Fkernel_boot_time.html%23. Specifically the section about disabeling the real time clock, first of all the config file is now called tegra_defconfig, it was named tegra21_defconfig in the earlier version. Further there is no line with

CONFIG_RTC_DRV_MAX77620=y

in that file, the only line that got close enough to this was:

CONFIG_RTC_DRV_MAX77686=y

is this ok to remove this line?
Also in the dts file mentioned tegra186-quill-p3310-1000-a00-00-base.dts there is no section about rtc {} is this normal? Do I just add the section that is mentioned in the explanation:

rtc {
        compatible = "nvidia,tegra-rtc";
        reg = <0x00000000 0x00000003 0x00000002 0x0000009b>;
        interrupts = <0x00000000 0x00000005 0x00000002>;
        status = "disabled";
    };

I have searched in all other dts files for any section remotely similar to this but apart from a section

rtc {
		nvidia,pmc-wakeup = <&tegra_pmc PMC_WAKE_TYPE_EVENT 16
				     PMC_TRIGGER_TYPE_HIGH>;
	};

that I found in the file ~/nvidia/nvidia_sdk/JetPack_4.2_Linux_P3310/Linux_for_Tegra/sources/hardware/nvidia/platform/t210/jetson/kernel-dts/tegra210-jetson-common.dtsi