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2 Useful notes on bulding and using of U-Boot on
8    The DesignWare ARC EM Software Development Platform is FPGA-bases platform
12    versions of ARC EM CPUs. U-Boot is built to be run on the simplest
16    The board has the following features useful for U-Boot:
17     * On-board 2-channel FTDI TTL-to-USB converter
18       - The first channel is used for serial debug port (which makes it possible
22         There's no HW flow-control and baud-rate is 115200.
24       - The second channel is used for built-in Digilent USB JTAG probe.
29       - Also with help of this FTDI chip it is possible to reset entire
30         board with help of a special `rff-ftdi-reset` utility, see:
31         https://github.com/foss-for-synopsys-dwc-arc-processors/rff-ftdi-reset
33     * Micro SD-card slot
34       - U-Boot expects to see the very first partition on the card formatted as
35         FAT file-system and uses it for keeping its environment in `uboot.env`
36         file. Note uboot.env is not just a text file but it is auto-generated
37         file created by U-Boot on invocation of `saveenv` command.
41       - There might be more useful files on that first FAT partition like
45       - This so-called "ROM" is a part of FPGA image and even though it
47         on the next power-on.
50    BUILDING U-BOOT
52    1. Configure U-Boot:
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63       This will produce `u-boot` Elf file.
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67       make u-boot.bin
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71    EXECUTING U-BOOT
73    1. The EMSDP board is supposed to auto-start U-Boot image stored in ROM on
74       power-on. For that make sure VCCIO DIP-switches are all in "off" state.
76    2. Though it is possible to load U-Boot as a simple Elf file via JTAG right
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82       mdb -dll=opxdarc.so -OK -preloadexec="eval *(int*)0xf0001000=0" u-boot
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