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[Armbian build PR] - Add SK-AM68 and SK-AM69 board support


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Description

This PR adds support for the Texas Instruments SK-AM68 and SK-AM69 boards.

Notable features of SK-AM68 board:

  • 16GB LPDDR4‐4266 with support for inline error correction code (ECC)
  • DisplayPort 4K resolution with MST support and HDMI
  • Two CSI-2 ports compatible with Raspberry Pi
  • 8 TOPS deep-learning performance and hardware-accelerated edge AI
  • Three USB 3.0 Type A ports, one USB 3.0 Type C port
  • Gigabit Ethernet and 4x CAN-FD Headers
  • One M.2 key M connector

Notable features of SK-AM69 board:

  • 32GB LPDDR4‐4266 with support for inline error correction code (ECC)
  • DisplayPort 4K resolution with MST support and HDMI
  • Three CSI-2 ports compatible with Raspberry Pi
  • 32 TOPS deep-learning performance and hardware-accelerated edge AI
  • Three USB 3.0 Type A ports, one USB 3.0 Type C port
  • Gigabit Ethernet and 4x CAN-FD Headers
  • One M.2 key E connector and one M.2 key M connector

Further details like features, schematics and purchase links can be found on the board page: SK-AM68 SK-AM69

Note: To support SK-AM69 board, we had to switch U-Boot source for K3 family devices to ti-u-boot:2023.04 (commit 1), since boot configs for SK-AM69 board has not been upstreamed yet.

How Has This Been Tested?

First, we verified that the changes introduced do not deprecate any existing board support by:

  • [ ] Build and boot SK-AM62B Jammy CLI/Standard on Edge(v6.6) kernel
  • [ ] Build and boot SK-AM64B Jammy CLI/Standard on Current(v6.1) and Edge(v6.6) kernels
  • [ ] Build and boot SK-TDA4VM Jammy CLI/Standard on Current(v6.1) and Edge(v6.6) kernels

Further, the functionalities of new boards were tested by:

  • [ ] Build and boot SK-AM68 Jammy CLI/Standard on Current(v6.1) and Edge(v6.6) kernels
  • [ ] Build and boot SK-AM69 Jammy CLI/Standard on Current(v6.1) and Edge(v6.6) kernels
  • [ ] Gbit Ethernet works
  • [ ] USB 3.0 ports work

Checklist:

  • [ ] My code follows the style guidelines of this project
  • [ ] I have performed a self-review of my own code
  • [ ] I have commented my code, particularly in hard-to-understand areas
  • [ ] I have made corresponding changes to the documentation
  • [ ] My changes generate no new warnings
  • [ ] Any dependent changes have been merged and published in downstream modules

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