u-boot/board/logicpd/omap3som
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
..
Kconfig omap3: omap3_logic: switch to using TI_COMMON_CMD_OPTION 2017-05-15 13:00:27 -04:00
MAINTAINERS OMAP3LOGIC: Update maintainer 2016-02-15 12:04:45 -05:00
Makefile SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
omap3logic.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
omap3logic.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
README ARM: omap3_logic: Enable NAND unlocking during Falcon mode 2017-12-12 21:33:38 -05:00

Summary
=======

The source for omap3som encompases the DM3730 SOM-LV and DM3730 Torpedo platforms.

By default, the Torpedo Device Tree is integrated into U-Boot,but the MMC controller, GPIO and I2C controllers are the same, so for the purposes of loading U-Boot, it should be sufficient.  However this will display the Model as "LogicPD Zoom DM3730 Torpedo + Wireless Development Kit" upon boot.

The actual board remains autodetected and the Board will read "DM37xx SOM LV" when used on the DM37 SOM-LV.  The device tree loaded with Linux is also correct.

Integrating the SOM-LV Device Tree into U-Boot
==============================================

This step is optional, but should you want to change the default to the SOM-LV, locate the configs/omap3_logic_defconfig file and make the following change.

  CONFIG_DEFAULT_DEVICE_TREE="logicpd-som-lv-37xx-devkit"

  make distclean
  make omap3_logic_defconfig

Falcon Mode: FAT SD cards
=========================

In this case the additional file is written to the filesystem.  In this
example we assume that the uImage and device tree to be used are already on
the FAT filesystem (only the uImage MUST be for this to function
afterwards) along with a Falcon Mode aware MLO and the FAT partition has
already been created and marked bootable:

U-Boot # mmc rescan
# Load kernel and device tree into memory, perform export
U-Boot # fatload mmc 0 ${loadaddr} uImage
U-Boot # run loadfdt
U-Boot # setenv optargs quiet
U-Boot # run mmcargs
U-Boot # run common_bootargs
U-Boot # spl export fdt ${loadaddr} - ${fdtaddr}

This will print a number of lines and then end with something like:
   Loading Device Tree to 8dec9000, end 8dee0295 ... OK

So then note the starting address and write the args to mmc/sd:

U-Boot # fatwrite mmc 0:1 0x8dec9000 args 0x20000

The size of 0x20000 matches the CMD_SPL_WRITE_SIZE.

Falcon Mode: NAND
=================

In this case the additional data is written to another partition of the
NAND.  In this example we assume that the uImage and device tree to be are
already located on the NAND somewhere (such as filesystem or mtd partition)
along with a Falcon Mode aware MLO written to the correct locations for
booting and mtdparts have been configured correctly for the board:

U-Boot # nand read ${loadaddr} kernel
U-Boot # load nand rootfs ${fdtaddr} /boot/am335x-evm.dtb
U-Boot # run nandargs
U-Boot # run common_bootargs
U-Boot # spl export fdt ${loadaddr} - ${fdtaddr}
U-Boot # nand erase.part u-boot-spl-os
U-Boot # nand write ${fdtaddr} u-boot-spl-os