| TI Keystone Linux Overview |
| -------------------------- |
| |
| Introduction |
| ------------ |
| Keystone range of SoCs are based on ARM Cortex-A15 MPCore Processors |
| and c66x DSP cores. This document describes essential information required |
| for users to run Linux on Keystone based EVMs from Texas Instruments. |
| |
| Following SoCs & EVMs are currently supported:- |
| |
| ------------ K2HK SoC and EVM -------------------------------------------------- |
| |
| a.k.a Keystone 2 Hawking/Kepler SoC |
| TCI6636K2H & TCI6636K2K: See documentation at |
| http://www.ti.com/product/tci6638k2k |
| http://www.ti.com/product/tci6638k2h |
| |
| EVM: |
| http://www.advantech.com/Support/TI-EVM/EVMK2HX_sd.aspx |
| |
| ------------ K2E SoC and EVM --------------------------------------------------- |
| |
| a.k.a Keystone 2 Edison SoC |
| K2E - 66AK2E05: See documentation at |
| http://www.ti.com/product/66AK2E05/technicaldocuments |
| |
| EVM: |
| https://www.einfochips.com/index.php/partnerships/texas-instruments/k2e-evm.html |
| |
| ------------ K2L SoC and EVM --------------------------------------------------- |
| |
| a.k.a Keystone 2 Lamarr SoC |
| K2L - TCI6630K2L: See documentation at |
| http://www.ti.com/product/TCI6630K2L/technicaldocuments |
| EVM: |
| https://www.einfochips.com/index.php/partnerships/texas-instruments/k2l-evm.html |
| |
| Configuration |
| ------------- |
| |
| All of the K2 SoCs/EVMs share a common defconfig, keystone_defconfig and same |
| image is used to boot on individual EVMs. The platform configuration is |
| specified through DTS. Following are the DTS used:- |
| K2HK EVM : k2hk-evm.dts |
| K2E EVM : k2e-evm.dts |
| K2L EVM : k2l-evm.dts |
| |
| The device tree documentation for the keystone machines are located at |
| Documentation/devicetree/bindings/arm/keystone/keystone.txt |
| |
| Known issues & workaround |
| ------------------------- |
| |
| Some of the device drivers used on keystone are re-used from that from |
| DaVinci and other TI SoCs. These device drivers may use clock APIs directly. |
| Some of the keystone specific drivers such as netcp uses run time power |
| management API instead to enable clock. As this API has limitations on |
| keystone, following workaround is needed to boot Linux. |
| |
| Add 'clk_ignore_unused' to the bootargs env variable in u-boot. Otherwise |
| clock frameworks will try to disable clocks that are unused and disable |
| the hardware. This is because netcp related power domain and clock |
| domains are enabled in u-boot as run time power management API currently |
| doesn't enable clocks for netcp due to a limitation. This workaround is |
| expected to be removed in the future when proper API support becomes |
| available. Until then, this work around is needed. |
| |
| |
| Document Author |
| --------------- |
| Murali Karicheri <m-karicheri2@ti.com> |
| Copyright 2015 Texas Instruments |
