Beaglebone - Revision history

ViciousCarnivore: /* Where are the registers for the BBB? */

2026-06-25T05:24:02Z

Where are the registers for the BBB?

2026-06-25T05:23:38Z

Devmem2 Install

2026-06-25T05:08:15Z

Devmem2 Install

2026-06-25T04:48:21Z

2026-02-24T07:43:13Z

Ground A Pin

2026-02-24T07:23:01Z

Moving Resistor

2026-02-24T07:22:39Z

Always Boot from SD Card

2025-06-20T00:19:48Z

2025-06-20T00:19:18Z

Update && Change Kernel

2025-06-19T23:53:14Z

No Video Display on Devuan/Debian 10 after Update

@@ Line 151: / Line 151: @@
 e.g.
 https://www.ti.com/lit/ug/spruh73q/spruh73q.pdf
 ===Booting Alpine on the Beaglebone===

@@ Line 225: / Line 225: @@
 Install steps source: Scivision: Devmem2 on the beaglebone black The author of devmem2 (Jan-Derk Bakker, website and code found at lartmaker.nl), his website is down at the moment. You can view the root domain at internet archive, but the page for devmem2 is not  available. Others like VCTLabs above have copied his code to various spots. See also the Notes section below.
 (NOTE: The above was taken from: https://wiki.zoneminder.com/index.php?title=Dedicated_SBC_Camera_Monitor&oldid=16692)
 ==Beagleboard==

@@ Line 219: / Line 219: @@
   nano /etc/rc.local
   devmem2 0x4c000054 w 0x00FFFFF10
 Watch syslog and FIFO errors should immediately stop upon entering write command on memory.

@@ Line 206: / Line 206: @@
 per https://wiki.zoneminder.com/Dedicated_SBC_Camera_Monitor#Auto_Start_Computer
 If you search this online, for some reason you don't get this answer.
 ==Beagleboard==

@@ 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. See the schematic.
+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.
 ====Moving Resistor====

@@ Line 139: / Line 139: @@
 <small>ref: https://stackoverflow.com/questions/33030802/fix-the-boot-order-emmc-on-a-beagle-bone-black</small>
-A latching switch would be nice. Onboard flash is built in obsolescence.
+A latching switch would be nice. Onboard flash is built in obsolescence. It's one of the flaws with the beaglebone. It is always in the way.
 =====Instructions=====

@@ Line 129: / Line 129: @@
 [[File:DSCN3116.JPG|300px|thumb|right|Monitoring temperature w/a beagle and LMT84 / LM35]]
 ===Always Boot from SD Card===
   "...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>
@@ Line 134: / Line 141: @@
 A latching switch would be nice. Onboard flash is built in obsolescence.
-====Instructions====
+=====Instructions=====
 Put some leaded solder on both sides of R68 (bottom of board, the silkscreen is misplaced, but just count down the line). Use hot air to remove R68, being careful not to use too much air flow which will knock the resistor off your bench, onto the floor. The resistor is a 100K, in case you lose it.
 After removing the resistor, use an iron to put small dobs of leaded solder on pad R93 (top side of board). Use hot air to heat the board until the solder is fluid, then place the 100K R onto R93, heating as necessary while being careful not to blow the resistor away.
 ===Where are the registers for the BBB?===
 AM335x_TechnicalReferenceManual.pdf

@@ Line 191: / Line 191: @@
 The trap is that if you try to apt install a debian arm kernel, the beagle may not even boot.
-=== Login to Console without User Interaction ===
+=== Login to Console (HDMI LCD) without User Interaction ===
 This always confuses me. I've done it before. It's handled with inittab.
   Edit /etc/inittab (comment out existing, and add this below. Replace username with your new user):

← Older revision		Revision as of 00:19, 20 June 2025
Line 190:		Line 190:

	The trap is that if you try to apt install a debian arm kernel, the beagle may not even boot.		The trap is that if you try to apt install a debian arm kernel, the beagle may not even boot.
		+
		+	=== Login to Console without User Interaction ===
		+	This always confuses me. I've done it before. It's handled with inittab.
		+	Edit /etc/inittab (comment out existing, and add this below. Replace username with your new user):
		+	1:2345:respawn:/bin/login -f USERNAME tty1 </dev/tty1 >/dev/tty1 2>&1
		+
		+	per https://wiki.zoneminder.com/Dedicated_SBC_Camera_Monitor#Auto_Start_Computer
		+	If you search this online, for some reason you don't get this answer.

	==Beagleboard==		==Beagleboard==

@@ Line 177: / Line 177: @@
 See also: https://forum.beagleboard.org/t/no-hdmi-output-on-beaglebone-black/22391 Which has the sys fs entry for the HDMI (useful).
   e.g. root@beaglebone:/sys/class/drm/card0/card0-HDMI-A-1# parse-edid edid
 Note that the Beagle will indicate the HDMI is enabled and connected, if you only connect a cable. You don't have to actually have a screen connected. At least in my setup.