Linux Boot Configuration

Here you can find all hekate boot entry ini keys supported by Linux.

L4T .ini Configuration

Warning: Never use # to comment out keys in the ini. Either avoid them or use ; in front to invalidate a key. Example: rootdev=mmcblk0p2 -> ;rootdev=mmcblk0p2 Also, never have an empty line between keys.

Below you can find all supported keys and their defaults.

.ini Boot Entry Config Keys

• l4t=1 1: Enables and parses the .ini boot entry with L4T Loader. Mandatory!

• boot_prefixes=/switchroot/ubuntu/ Sets the main L4T boot directory. Mandatory!

• emmc=0 1: Enable eMMC. Also allows booting from eMMC.

• id=SWR-UBU Set FS Label name. SWR-UBU or something else by default. Used to automatically find the correct linux partition. Mandatory if rootdev is not defined!

• rootdev=mmcblk0p2 Default disk and linux partition. Gets overridden via id if FS label is found. Mandatory if id is not defined! (sda1, sda2, sdb1, mmcblk0p2, mmcblk1p1, etc)

• rootfstype=ext4 Sets linux partition FS type. Only ext4 is generally suggested since other filesystems use more CPU or they are slower.

• rootfs_fw=/lib/firmware/ Sets firmware directory for kernel to search in.

• rootlabel_retries=1 How many times to retry and search rootdev. Each iteration is 200ms. Useful when booting via USB (use 50 for 10s max polling).

• auto_rootdev_disable Disable rootdev search done by initramfs which uses id.

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• r2p_action=self self: Reboots to self. bootloader: Reboots to bootloader menu. normal: Reboots with no config. Allows default auto boot to be used.

• usb3_enable=0 1: Enable USB3 support. Enabling it can decrease WiFi 2.4GHz and Bluetooth signal quality.

• 4k60_disable=0 1: Disable 4K@60 for Nintendo Switch (OLED). If [usb3_enable] is set and 4K@60 is not disabled, the driver will automatically choose between USB3 and 4K@60. 4K@60 is preferred in that case.

• uart_port=0 0: Disable serial logging 1: Enable serial logging on UART-A (internal testpads) 2: Enable serial logging on UART-B (right joycon rail) 3: Enable serial logging on UART-C (left joycon rail) 4: Enable serial logging on USB

• earlycon=0 1: If UART logging is enabled, this enables early boot logging. If disabled, the backlog will be printed after uart driver init.

• fbconsole=9 0: Enable kernel logging on built-in display. 1: Enable kernel logging on DP/HDMI/VGA. 9: Disables kernel logging on any display.

• als_enable=0 1: Enable Ambient Light Sensor.

• jc_rail_disable=0 1: Disable railed Joycon support.

• cec_disable=0 1: Disable auto DP/HDMI CEC negotiation.

• touch_skip_tuning=0 1: Disables touch panel tuning on boot. Some panels with broken flex cable might need it.

• bt_ertm_disable=0 1: Disable Bluetooth Enhanced Retransmission mode. Might help with some Xbox Bluetooth based controllers.

• wifi_disable_vht80=0 1: Disable Wi-Fi VHT80 and VHT160 bonding (5GHz band). In case wifi card firmware hangs when fully used at such speeds and kernel panics, that might help to mitigate that issue.

• bootargs_extra= Set extra kernel command line arguments.

Overclocking

• dvfsb=0 1: Enable DVFS B-Side for CPU/GPU/Core. T210B01 only. Reduces power draw in order to use less battery for the same performance. Can also allow higher CPU/GPU clocks. If OC is used, the reduced power draw is negated.

• gpu_dvfsc=0 1: Enable DVFS C-Side for GPU. T210B01 only. Reduces power draw drastically on GPU frequencies of 768/844 MHz and up. Allows up to 1228 MHz clocks on select speedo binnings.

• limit_gpu_clk=0 1: Set GPU clock hard limit to 1075 MHz. T210B01 only. Helps when gpu_dvfsc is enabled and GPU can't handle the higher frequencies in such low voltages.

• ram_oc=0 ram_oc_opt=0 ram_oc_vdd2=0 ram_oc_vddq=0 Set RAM Overclock configuration. Check RAM Overclocking Info for more.