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Overview.txt

Overview.txt 2.6 KB
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  1. 		TI Keystone Linux Overview
    2. 

  2. 		--------------------------
    3. 

  3. 

  4. Introduction
    5. 

  5. ------------
    6. 

  6. Keystone range of SoCs are based on ARM Cortex-A15 MPCore Processors
    7. 

  7. and c66x DSP cores. This document describes essential information required
    8. 

  8. for users to run Linux on Keystone based EVMs from Texas Instruments.
    9. 

  9. 

  10. Following SoCs  & EVMs are currently supported:-
    11. 

  11. 

  12. ------------ K2HK SoC and EVM --------------------------------------------------
    13. 

  13. 

  14. a.k.a Keystone 2 Hawking/Kepler SoC
    15. 

  15. TCI6636K2H & TCI6636K2K: See documentation at
    16. 

  16. 	http://www.ti.com/product/tci6638k2k
    17. 

  17. 	http://www.ti.com/product/tci6638k2h
    18. 

  18. 

  19. EVM:
    20. 

  20. http://www.advantech.com/Support/TI-EVM/EVMK2HX_sd.aspx
    21. 

  21. 

  22. ------------ K2E SoC and EVM ---------------------------------------------------
    23. 

  23. 

  24. a.k.a Keystone 2 Edison SoC
    25. 

  25. K2E  -  66AK2E05: See documentation at
    26. 

  26. 	http://www.ti.com/product/66AK2E05/technicaldocuments
    27. 

  27. 

  28. EVM:
    29. 

  29. https://www.einfochips.com/index.php/partnerships/texas-instruments/k2e-evm.html
    30. 

  30. 

  31. ------------ K2L SoC and EVM ---------------------------------------------------
    32. 

  32. 

  33. a.k.a Keystone 2 Lamarr SoC
    34. 

  34. K2L  -  TCI6630K2L: See documentation at
    35. 

  35. 	http://www.ti.com/product/TCI6630K2L/technicaldocuments
    36. 

  36. EVM:
    37. 

  37. https://www.einfochips.com/index.php/partnerships/texas-instruments/k2l-evm.html
    38. 

  38. 

  39. Configuration
    40. 

  40. -------------
    41. 

  41. 

  42. All of the K2 SoCs/EVMs share a common defconfig, keystone_defconfig and same
    43. 

  43. image is used to boot on individual EVMs. The platform configuration is
    44. 

  44. specified through DTS. Following are the DTS used:-
    45. 

  45. 	K2HK EVM : k2hk-evm.dts
    46. 

  46. 	K2E EVM  : k2e-evm.dts
    47. 

  47. 	K2L EVM  : k2l-evm.dts
    48. 

  48. 

  49. The device tree documentation for the keystone machines are located at
    50. 

  50.         Documentation/devicetree/bindings/arm/keystone/keystone.txt
    51. 

  51. 

  52. Known issues & workaround
    53. 

  53. -------------------------
    54. 

  54. 

  55. Some of the device drivers used on keystone are re-used from that from
    56. 

  56. DaVinci and other TI SoCs. These device drivers may use clock APIs directly.
    57. 

  57. Some of the keystone specific drivers such as netcp uses run time power
    58. 

  58. management API instead to enable clock. As this API has limitations on
    59. 

  59. keystone, following workaround is needed to boot Linux.
    60. 

  60. 

  61.    Add 'clk_ignore_unused' to the bootargs env variable in u-boot. Otherwise
    62. 

  62.    clock frameworks will try to disable clocks that are unused and disable
    63. 

  63.    the hardware. This is because netcp related power domain and clock
    64. 

  64.    domains are enabled in u-boot as run time power management API currently
    65. 

  65.    doesn't enable clocks for netcp due to a limitation. This workaround is
    66. 

  66.    expected to be removed in the future when proper API support becomes
    67. 

  67.    available. Until then, this work around is needed.
    68. 

  68. 

  69. 

  70. Document Author
    71. 

  71. ---------------
    72. 

  72. Murali Karicheri <m-karicheri2@ti.com>
    73. 

  73. Copyright 2015 Texas Instruments
    74.