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arm: socfpga: agilex3: Add Agilex3 SoCFPGA support - #1020

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Add initial Agilex3 SoCDK board support based on the Agilex5 platform. Agilex3 reuses the Agilex5 SoC DTSI, U-Boot DTSI, and defconfig, with these board-level differences:

  • Ethernet uses GMAC2 only with a Micrel KSZ90X1 PHY. Agilex5 enables GMAC0 and GMAC2 with a Marvell PHY
  • QSPI map is 12 MiB u-boot + 52 MiB root with U-Boot offset 0xa00000. Agilex5 uses 66 MiB + 190 MiB and offset 0x4000000
  • QSPI boot script adds a fallback MTD layout for the smaller Agilex3 flash
  • MMC enables SDR104 (sdhci-caps-mask) in the board DT

Please do not submit a Pull Request via github. Our project makes use of
mailing lists for patch submission and review. For more details please
see https://u-boot.readthedocs.io/en/latest/develop/sending_patches.html

The only exception to this is in order to trigger a CI loop on Azure prior
to posting of patches.

Add initial Agilex3 SoCDK board support based on the Agilex5 platform.
Agilex3 reuses the Agilex5 SoC DTSI, U-Boot DTSI, and defconfig, with
these board-level differences:

- Ethernet uses GMAC2 only with a Micrel KSZ90X1 PHY. Agilex5 enables
  GMAC0 and GMAC2 with a Marvell PHY
- QSPI map is 12 MiB u-boot + 52 MiB root with U-Boot offset 0xa00000.
  Agilex5 uses 66 MiB + 190 MiB and offset 0x4000000
- QSPI boot script adds a fallback MTD layout for the smaller Agilex3
  flash
- MMC enables SDR104 (sdhci-caps-mask) in the board DT

Signed-off-by: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi@altera.com>
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