Integrate meta-seco-imx/u-boot-seco-imx/seco_lf_v2021.04-gm_d18

Commit: edgehog/layers/seco/meta-seco-imx@fb0c4dd8

Integrate u-boot-seco-imx/seco_lf_v2021.04-gm_d18

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@df7e99c3

[D18] use SECO custom U-Boot prompt text

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@93b10015

[D18] fix boot options typos

• select root variables for filesystem device list

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@a2f52221

[D18] upgrade straps management

• fix board revision straps recognition
• add ETH1 and eDP straps (gpio expander) recognition
• add board strap and gpio expander strap print
• ETH1 strap: update devicetree
• add video overlay lists (multiple configurations)
  • for seco_config tool
  • HDMI, eDP, LVDS options
• eDP strap: select video overlay list

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@dbb43dad

[D18] add second audio peripheral overlay list

• for seco_config tool
• bluetooth audio option

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@da200cc4

[i.MX8MP][D18] add initial dtbo parameters for seco_config

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@0de5cf54

[D18] add board to SECO build ecosystem, resize u-boot environment

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@5c4b61a1

[D18] enable ethernet ports

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@752f71ac

[D18] set gpio expander strap pull-up

• P1_6 --> SECO_CODE_7 (eDP)
• P1_7 --> SECO_CODE_8 (ETH1)

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@4f0901e1

[D18] enable gpio expander

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@f72b7576

[D18] disable u-boot video output

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@353dea88

[D18] setup SECO environment, set MMC enumeration

• internal eMMC --> device 0
• external SD --> device 1

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@366388be

[D18] add dynamic RAM size support

• initial support for board straps management
• WARNING: 8GB ram size is not working

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@65b54fde

[i.MX8] make spl_board_boot_device overwritable by specific board implementation

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@ff1f0d02

[D18] external SD: fix write protect

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@4a6153d2

[D18] external SD: fix voltage to 3.3V

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Commit: edgehog/bsp/nxp/u-boot-seco-imx@c31f2c15

[i.MX8MP][D18] init porting derived from nxp imx8mp_evk