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Connectors

ViciousCarnivore — Sun, 27 Sep 2026 07:49:42 GMT

Arduino Jumper Wires / Dupont Connectors / Mini-PV

Beaglebone

ViciousCarnivore — Fri, 25 Sep 2026 05:01:23 GMT

Power Saving

File:Gnumeric image.png

ViciousCarnivore — Fri, 25 Sep 2026 04:56:14 GMT

ViciousCarnivore moved page File:Gnumeric image.png to File:Quick Beaglebone Power Usage Tests.png Not descriptive enough name.

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File:Gnumeric image.png

ViciousCarnivore — Fri, 25 Sep 2026 04:55:39 GMT

ViciousCarnivore uploaded File:Gnumeric image.png

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FPGA - Rotary Encoder

ViciousCarnivore — Fri, 25 Sep 2026 03:05:49 GMT

Resources

Beaglebone

ViciousCarnivore — Wed, 23 Sep 2026 07:09:22 GMT

What Doesn't Work As Well

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File:Beaglebone2.jpg

ViciousCarnivore — Mon, 21 Sep 2026 07:16:41 GMT

ViciousCarnivore uploaded File:Beaglebone2.jpg

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Beaglebone

ViciousCarnivore — Mon, 21 Sep 2026 07:14:53 GMT

Alpine

ViciousCarnivore — Mon, 21 Sep 2026 01:48:00 GMT

Links

@@ Line 8: / Line 8: @@
 ==Tips/Techniques==
 ===Misc===
 * https://www.eevblog.com/forum/beginners/test-lead-connectors/ - Connectors on machinery. Isolated BNCs. Tying the two leads in an overhand knot.

@@ Line 198: / Line 198: @@
 === DTB files can be Reverse Engineered ===
 I just learned this today. Ask a search engine. I'm not sure if they lose any comments or details, but it's better than nothing. There is a one line command to convert dtb to dts.
 ==Beagleboard==

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 * [https://www.eevblog.com/forum/projects/rotary-encoders-new-polling-and-pin-interrupt-servicing-routines/ EEVblog Forum] The algorithm for the Rotary was from here.
 * [http://dangerousprototypes.com/docs/CPLD:_Complex_programmable_logic_devices#CPLD_development_tutorials] Some basic vhdl/verilog/schematic entry examples for ISE. A good place to start, although I like HamsterNZ's pdf better. Still, some good info here on setup, and initialization. Good on these gentlemen for their use of CC-0 / Public Domain.
 {{Electronics}}

@@ Line 1: / Line 1: @@
-<small>The beaglebone is similar to the RPI, but more powerful for microcontroller applications. There are more accessible GPIO and peripherals and it has a bit more soul.
+<small>The beaglebone is similar to the RPI, but more powerful for microcontroller applications. There are more accessible GPIO, peripherals, a PRU, and it has a bit more soul.
@@ Line 133: / Line 133: @@
 https://forum.beagleboard.org/t/how-to-force-boot-from-sd-card-other-than-by-holding-the-button-down/35633/6
-This is easier than moving a resistor. on the BBG, it is pin P8_43 to ground. You might want to put a 100ohm resistor in there to mimic the boot switch (though I found it was not necessary). See the schematic.
+This is easier than moving a resistor. on the BBB, it is pin P8_43 to ground. See the schematic.
 ====Moving Resistor====
   "...move R68 to R93 if you want to make the board boot from SD by default."
-<small>ref: https://stackoverflow.com/questions/33030802/fix-the-boot-order-emmc-on-a-beagle-bone-black</small>
+<small>ref: https://stackoverflow.com/questions/33030802/fix-the-boot-order-emmc-on-a-beagle-bone-black</small> This was the original advice I found, and it was incorrect as grounding a pin is easier.
 =====Instructions=====
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 About 2-3 hours of work. https://wiki.alpinelinux.org/wiki/Alpine_on_ARM is the basic guide to follow. There is a lot of instructions online that are not necessarily helpful. https://www.beagleboard.org/blog/2022-06-06-using-the-u-boot-extension-board-manager-beaglebone-boards-example Is not necessary. These guides https://elinux.org/Category:ECE497 Are incomplete, though they are somewhat useful. (for example: https://elinux.org/EBC_Exercise_22_Recovering Doesn't have enough detail to start from scratch (how do you format the partitions), and https://elinux.org/EBC_Exercise_03_Installing_a_Beagle_OS uses one of those programs (balenaetcher) that are unnecessary on Linux when you have dd and fdisk. This https://elinux.org/EBC_Exercise_21a_Boot_Sequence only covers using u-boot, not the installation / partitioning of u-boot. Not helpful. This gives some hand-wavey instructions but is not thorough enough: https://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0  However, this stackexchange article is well documented https://stackoverflow.com/questions/60873038/how-to-write-new-mlo-and-u-boot-img-to-an-sd-card-without-erasing-the-os Though it shows how difficult it is to find the info. It points to the am355x reference manual. It also indicates that old pre-existing MLO and uboot images may need to be zeroed on the sd card.
-Anyways, with all those links being reviewed, you can look back at the alpine_on_arm page. Also download the generic u-boot alpine image (not the standard one) https://dl-cdn.alpinelinux.org/alpine/v3.21/releases/armv7/alpine-uboot-3.21.3-armv7.tar.gz which has a README, in the u-boot folder (easy to miss, and obscure) that indicates, that for the beaglebone, you need the MLO and u-boot.img (that they provide) copied to the beginning of the first FAT partition of the disk. This is similar but reversed from the alpine_on_arm page's instructions. Anyways, doing this, then you simply tar -xf the alpine-uboot img to the rest of the partition. Make sure the partition is big enough. 100M won't be enough, so I used 1G. Then finally, load the sd card in the bbb and it should just boot.
+Anyways, with all those links being reviewed, you can look back at the alpine_on_arm page. Also download the generic u-boot alpine image (not the standard one) https://dl-cdn.alpinelinux.org/alpine/v3.21/releases/armv7/alpine-uboot-3.21.3-armv7.tar.gz which has a README, in the u-boot folder (easy to miss, and obscure) that indicates, that for the beaglebone, you need the MLO and u-boot.img (that they provide) copied to the beginning of the first FAT partition of the disk. This is similar but reversed from the alpine_on_arm page's instructions. Anyways, doing this, then you simply (tar -xf alpine-uboot img --directory=sdcard) to the rest of the partition. Make sure the partition is big enough. 100M won't be enough, so I used 1G. Then finally, load the sd card in the bbb and it should just boot.
 Note that the generic uboot folder in the alpine image contains a number of uboot images for a variety of arm boards, such as the Cubieboard, RPI, and Bananapi. I would recommend you look at these entries to see how the uboot loading differs. Those boards will be likely to work, given someone went to the trouble of including them in the image.
@@ Line 163: / Line 161: @@
 And when it boots, it is the minimal alpine image, so you must install from there.
-I think I started making the partition in fdisk at an offset of 32768, as the alpine guide recommended it. I also zeroed out the old possibly conflicting regions where the u-boot from the beagleboard debian images may have been left over. Make sure the partition is bootable. NOTE: the alpine image listed above does not work with ethernet out of the box. May need to re-compile or use a usb hub and a different wifi or usb adapter (the config lists support for a lot of network cards).
+I zeroed out the old possibly conflicting regions where the u-boot from the beagleboard debian images may have been left over (sgdisk --zap-all). Make sure the partition is bootable. NOTE: the alpine image listed above does not work with ethernet out of the box. May need to re-compile or use a usb hub and a different wifi or usb adapter (the config lists support for a lot of network cards). I found a usb ethernet adapter worked.
 For reference, here's what the README says in the alpine u-boot images.
@@ Line 176: / Line 174: @@
    cp am335x_boneblack/{MLO,u-boot.img} /media/mmcblk0p1/
 </pre>
 Based on this, and on the stackexchange post above, you can see that every SBC will have different behavior when it loads the uboot files. And the reference manual, should give information on how it works.
 ===No Video Display on Devuan/Debian 10 after Update===
@@ Line 274: / Line 319: @@
 They should be in /lib/firmware/ (This page also has instructions to compile them).
 ==Beagleboard==
@@ Line 295: / Line 343: @@
 Angstrom loads on the old uboot without problem. Debian Buster Console (link: https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Debian_Buster_Console_Snapshot_for_BeagleBoard-xM tested: bbxm-debian-10.4-console-xm-armhf-2020-05-18-1gb.img.xz) also loads, though requires holding user button upon boot (forces boot from mmc) due to uboot being ancient on the nand. See also:
 https://elinux.org/BeagleBoardDebian
 ====Angstrom: Tweaks to make====

@@ Line 163: / Line 163: @@
 ==Links==
-https://wiki.alpinelinux.org/wiki/Configure_Wake-on-LAN Configure_Wake-on-LAN
+* https://wiki.alpinelinux.org/wiki/Configure_Wake-on-LAN Configure_Wake-on-LAN
-gcompat - way to run glibc programs
+* gcompat - way to run glibc programs
-https://wiki.alpinelinux.org/wiki/Running_glibc_programs
+* https://wiki.alpinelinux.org/wiki/Running_glibc_programs
-https://ariadne.space/2021/04/25/why-apk-tools-is-different-than-other-package-managers/
+* https://ariadne.space/2021/04/25/why-apk-tools-is-different-than-other-package-managers/
 </small>
 {{GNU\Linux}}