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Diffstat (limited to 'board/qualcomm/dragonboard410c/readme.txt')
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diff --git a/board/qualcomm/dragonboard410c/readme.txt b/board/qualcomm/dragonboard410c/readme.txt new file mode 100644 index 0000000000..7fc7c7a79f --- /dev/null +++ b/board/qualcomm/dragonboard410c/readme.txt @@ -0,0 +1,71 @@ +# +# (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com> +# +# SPDX-License-Identifier: GPL-2.0+ +# + +Build & Run instructions: + +1) Install mkbootimg and dtbTool from + git://codeaurora.org/quic/kernel/skales (15ece94f09 worked for me) +2) Setup CROSS_COMPILE to aarch64 compiler +3) make dragonboard410c_config +4) make +5) generate fake, empty ramdisk (can have 0 bytes) +$ touch rd + +6) Generate qualcomm device tree table with dtbTool [1] +$ dtbTool -o dt.img arch/arm/dts + +7) Generate Android boot image with mkbootimg [2]: +$ mkbootimg --kernel=u-boot-dtb.bin --output=u-boot.img --dt=dt.img \ + --pagesize 2048 --base 0x80000000 --ramdisk=rd --cmdline="" + +8) Enter fastboot (reboot board with vol- button pressed) + +9) Boot it: +$ fastboot boot u-boot.img +or flash as kernel: +$ fastboot flash boot u-boot.img +$ fastboot reboot + + +What is working: +- UART +- GPIO (SoC) +- SD +- eMMC +- Reset +- USB in EHCI mode (usb starts does switch device->host, usb stop does the opposite) +- PMIC GPIOS (but not in generic subsystem) +- PMIC "special" buttons (power, vol-) + +What is not working / known bugs: +- SDHCI is slow (~2.5MiB/s for SD and eMMC) + +[1] To boot any kernel image, Little Kernel requires valid device tree for the +platform it runs on. dtbTool creates device tree table that Little Kernel scans. +Later on proper device tree is passed to next boot stage. +Full device tree is not required to boot u-boot. Enough would be: +/dts-v1/; + +/ { + model = "Qualcomm Technologies, Inc. Dragonboard 410c"; + compatible = "qcom,dragonboard", "qcom,apq8016-sbc"; + qcom,msm-id = <0xce 0x0 0xf8 0x0 0xf9 0x0 0xfa 0x0 0xf7 0x0>; + qcom,board-id = <0x10018 0x0>; + #address-cells = <0x2>; + #size-cells = <0x2>; + chosen { }; + aliases { }; + + memory { + device_type = "memory"; + reg = <0 0x80000000 0 0x3da00000>; + }; +}; + +but for simplicity (and because size of image is not that critical) we use +existing Qualcomm device trees. + +[2] Note that ramdisk is required, even if it is unused. |