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