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Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00
..
dragonboard410c.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
head.S SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
Kconfig board: Add Qualcomm Dragonboard 410C support 2016-04-01 17:18:27 -04:00
lowlevel_init.S SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
MAINTAINERS MAINTAINERS: board: qcom: db410c, db820c: update email. 2018-02-04 22:55:34 -05:00
Makefile SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
readme.txt SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
u-boot.lds SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00

readme.txt 

# SPDX-License-Identifier: GPL-2.0+
#
# (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>

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.