Add Artemis 'bootloader' dir

This directory is copied from the [SparkFun Artemis](https://github.com/sparkfun/SparkFun_Artemis) GitHub repo. It contains bootloader setting binaries for the Ambiq Secure Bootloader (SBL) at two different baud rates (921600 and 115200). These settings use *pad* 47 as the bootloader pin.

The bootloader readme also provides basic information on how to generate these SBL configuration binaries using the 'create_info0.py' script (which currently is located one directory up form here). When designing an Artemis module-based board it would be possible to redefine the bootloader pin for your needs.

Author: oclyke

tools/apollo3_scripts/sparkfun/artemis/bootloader/info0_artemis_47_115200.bin

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+//connect to device
+device AMA3B1KK-KBR
+si SWD
+speed 1000
+r
+sleep 10
+
+//set C runtime environment
+wreg MSP, 0x10000100
+
+// erase info0
+w4 0x10000000 0             // flash info instance
+w4 0x10000004 0xd894e09e    // info 0 key
+w4 0x10000008 0xFFFFFFFF    // clear return value
+setPC 0x08000085            // call the ROM helper function flash_info_erase_from_sram
+g
+sleep 50
+mem32 0x10000008 1          // dump return value for check
+
+// program info0
+w4 0x10000000 0             // flash info instance
+w4 0x10000004 0             // offset
+w4 0x10000008 0x800         // length in words
+w4 0x1000000C 0xd894e09e    // info 0 key
+w4 0x10000010 0xFFFFFFFF    // clear return value
+loadbin info0_artemis_47_115200.bin 0x10001000     //load the info0 binary into sram
+setPC 0x08000061            // call the ROM helper function flash_program_info_area_from_sram
+g
+sleep 50
+mem32 0x10000010 1          // dump return value for check
+
+// perform software POI
+w4 0x40000004 0x1B
+
+// quit
+qc

tools/apollo3_scripts/sparkfun/artemis/bootloader/info0_artemis_47_921600.bin

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+//connect to device
+device AMA3B1KK-KBR
+si SWD
+speed 1000
+r
+sleep 10
+
+//set C runtime environment
+wreg MSP, 0x10000100
+
+// erase info0
+w4 0x10000000 0             // flash info instance
+w4 0x10000004 0xd894e09e    // info 0 key
+w4 0x10000008 0xFFFFFFFF    // clear return value
+setPC 0x08000085            // call the ROM helper function flash_info_erase_from_sram
+g
+sleep 50
+mem32 0x10000008 1          // dump return value for check
+
+// program info0
+w4 0x10000000 0             // flash info instance
+w4 0x10000004 0             // offset
+w4 0x10000008 0x800         // length in words
+w4 0x1000000C 0xd894e09e    // info 0 key
+w4 0x10000010 0xFFFFFFFF    // clear return value
+//loadbin info0.bin 0x10001000     //load the info0 binary into sram
+loadbin info0_artemis_47_921600.bin 0x10001000     //load the info0 binary into sram
+setPC 0x08000061            // call the ROM helper function flash_program_info_area_from_sram
+g
+sleep 50
+mem32 0x10000010 1          // dump return value for check
+
+// perform software POI
+w4 0x40000004 0x1B
+
+// quit
+qc

tools/apollo3_scripts/sparkfun/artemis/bootloader/jlink-prog-115200.txt

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+
+jlink -CommanderScript jlink-prog-115200.txt
+pause

tools/apollo3_scripts/sparkfun/artemis/bootloader/jlink-prog-921600.txt

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+
+jlink -CommanderScript jlink-prog-921600.txt
+pause

tools/apollo3_scripts/sparkfun/artemis/bootloader/program_115200.bat

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+Artemis Bootloader
+==========================
+
+This is created based on the documents from Ambiq. See \AmbiqSuite-Rel2.x.x\docs\secure_bootloader\ for how to create your own image. 
+
+* Run the bootloader at 921600bps: --u0 0xE1000
+* Currently pin 47 is used for BOOTLOAD: --gpio 0x2f
+* Bootloader to check if BOOTLOAD pin is high (not low): --gpiolvl 1
+* Trim timeout to 250ms: --wTO 250
+
+This was used for Artemis v10 module that used pin 47 for boot:
+
+    create_info0.py --valid 1 info0_artemis_47 --pl 1 --u0 0xE1000c0 --u1 0xFFFF3031 --u2 0x2 --u3 0x0 --u4 0x0 --u5 0x0 --main 0xC000 --gpio 0x2f --version 0 --wTO 250 --gpiolvl 1
+
+Create 115200bps bootloader:
+
+    create_info0.py --valid 1 info0_artemis_47 --pl 1 --u0 0x1C200c0 --u1 0xFFFF3031 --u2 0x2 --u3 0x0 --u4 0x0 --u5 0x0 --main 0xC000 --gpio 0x2f --version 0 --wTO 250 --gpiolvl 1
+
+We have pre-compiled the fastest possible bootloader (921600bps) as well as the standard 115200bps. To program new bootloader: call program_xxxx.bat from command line with JLINK attached and Artemis powered from separate 3V supply.