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by burtyb
Tue Oct 08, 2019 1:34 pm
Forum: Advanced users
Topic: Pi4 64-bit raspbian kernel for testing - Focus on Pi4
Replies: 244
Views: 38612

Re: Pi4 64-bit raspbian kernel for testing - Focus on Pi4

Is there a config.txt conditional for 32/64 bit or what's the best way of loading a matching initramfs file?
by burtyb
Sun Jul 07, 2019 9:10 pm
Forum: General discussion
Topic: 3v3 drops on Pi4 reboot
Replies: 5
Views: 578

3v3 drops on Pi4 reboot

My HAT uses the 3v3 on the Pi GPIO for the EEPROM and an I/O Expander. On Pi <4 the 3v3 rail was permanently live meaning the Pi the HAT was on could be rebooted and it wouldn't reset the I/O Expander but on the Pi4 when I reboot the 3v3 power is cut resetting the I/O Expander. Is there any way to k...
by burtyb
Mon Jun 17, 2019 9:52 am
Forum: General discussion
Topic: can RPI-Zero work as RNDIS gadget while same time accepting USB mouse
Replies: 7
Views: 464

Re: can RPI-Zero work as RNDIS gadget while same time accepting USB mouse

featured wrote: i need to have rpi-zero connecting to a HOST cpu through RNDIS, yet i need to have pi-zero accept USB mouse.
It can do one or the other but not both at the same time.
by burtyb
Mon Jun 03, 2019 12:49 pm
Forum: General discussion
Topic: New Raspberrypi short circuit repair
Replies: 10
Views: 678

Re: New Raspberrypi short circuit repair

yes, I tried and that didn't work!! Any repair shop around there? My guess after a short would be a dead PMIC as that seems to be the (very IMHO) weak part on the 3 B+/A+. But sadly they used a custom variant so you can't just buy one (last I looked there are two versions publicly available with di...
by burtyb
Thu May 30, 2019 7:08 pm
Forum: Compute Module
Topic: Accessing SD/eMMC after booting Linux as a USB device
Replies: 0
Views: 403

Accessing SD/eMMC after booting Linux as a USB device

Using the CMIO board (with J4 set to EN) I'm booting Linux over USB with rpiboot. After it's booted how can I access the SD/eMMC for local storage/swap/etc. (without changing J4 to DIS)? The kernel seems to "sort of" be able to see it during boot [ 1.763745] sdhost: log_buf @ bad01000 (fad01000) [ 1...
by burtyb
Thu May 30, 2019 3:43 pm
Forum: Networking and servers
Topic: Routing from USB/Ethernet gadget to Ethernet Port
Replies: 2
Views: 883

Re: Routing from USB/Ethernet gadget to Ethernet Port

First problem, is I do not know how to let the Zero route from the 3's USB port and out the Ethernet port to the server on the ground. So the Zero cannot talk directly to the server, or the server cannot initiate a command to the Zero. I'd advise looking at (or even using) the modified Raspbian ima...
by burtyb
Mon May 20, 2019 10:17 am
Forum: General discussion
Topic: Multiple raspberry pi USB dongles?
Replies: 1
Views: 168

Re: Multiple raspberry pi USB dongles?

If I understand what you're asking then that is what the Cluster HAT does (Pi3 as the controller and up to 4 Pi Zeros plugged into it). You can do the same with a Pi Zero as the "controller", use either WiFi or a USB Ethernet adaptor to communicate to the outside world then plug other Pi Zeros into ...
by burtyb
Fri May 17, 2019 2:31 pm
Forum: Compute Module
Topic: Timeout booting Linux on CM3+ with rpiboot
Replies: 1
Views: 552

Re: Timeout booting Linux on CM3+ with rpiboot

I spotted https://www.raspberrypi.org/forums/viewtopic.php?t=189385 which seems to be the problem but instead of a slow boot (with eMMC) it doesn't boot at all with rpiboot due to the timeout. Either adding "hdmi_ignore_hotplug=1" to config.txt or adding pull up resistors on the "If unused leave ope...
by burtyb
Wed May 15, 2019 3:32 pm
Forum: General discussion
Topic: How to identify a 3 A+ capable of rpiboot/booting as a device?
Replies: 6
Views: 321

Re: How to identify a 3 A+ capable of rpiboot/booting as a device?

Does that mean "booting from a USB device" ? In this instance I do mean booting the 3 A+ as the USB device (not from USB storage) with rpiboot where the Pi is the USB device (as you can with the Pi Zeros/A+/CM). There was a change as they originally didn't work but the one I purchased yesterday aft...
by burtyb
Wed May 15, 2019 12:48 pm
Forum: General discussion
Topic: 3A+ usbboot/rpiboot - already possible?
Replies: 7
Views: 599

Re: 3A+ usbboot/rpiboot - already possible?

Good news everyone, I received new 3A+ yesterday (my first one) and when atached to my 3b+ with male to male usb cable and no microSD card the GPIO expander popup is shown and I see it in kernel log as boot device. It loads kernel and gpioexpander rootfs however then it hangs. So probaby the kernel...
by burtyb
Wed May 15, 2019 12:29 pm
Forum: General discussion
Topic: How to identify a 3 A+ capable of rpiboot/booting as a device?
Replies: 6
Views: 321

How to identify a 3 A+ capable of rpiboot/booting as a device?

So having recently found out there was change to the 3 A+ and newer versions are capable of booting as a USB device is there a way to determine which ones can be booted as a USB device from just the date code on the board or something (without plugging USB in and waiting for it to show up as a devic...
by burtyb
Tue May 14, 2019 11:51 am
Forum: Compute Module
Topic: Timeout booting Linux on CM3+ with rpiboot
Replies: 1
Views: 552

Timeout booting Linux on CM3+ with rpiboot

I've made a minimal carrier board which has only has - USB, UART0/1, GPIO28/29/44/45 are pulled to ground via 100k, std schematic/parts for emmc en/dis and have jumpers for USBBOOT and OTGID (floating). USBBOOT works OK when in MSD mode with rpiboot on Linux and also flashes without issue using Etch...
by burtyb
Mon Jan 28, 2019 6:01 pm
Forum: Compute Module
Topic: CM3+ Released with up to 32GB eMMC
Replies: 28
Views: 3164

Re: CM3+ Released with up to 32GB eMMC

I was amused by the one comment asking if the CM3+ board have 1GB or 2GB RAM, which indicates that he is unaware of the VC4 memory limitation. Probably confused by the comparison of the new CM3+ with the original CM and not the CM3 but I imagine saying "It has the newer BCM2837B0 but runs at the sa...
by burtyb
Fri Nov 16, 2018 1:16 pm
Forum: General discussion
Topic: 3A+ usbboot/rpiboot
Replies: 28
Views: 4368

Re: 3A+ usbboot/rpiboot

The first question would be; is it (1) the 3A+ hardware not presenting itself as a USB bootable device or (2) rpiboot simply not recognising how the 3A+ presents itself ? Sorry I should have made my post clearer it doesn't show up as a device at all which is why I asked if there was a hardware mod ...
by burtyb
Fri Nov 16, 2018 11:01 am
Forum: General discussion
Topic: 3A+ usbboot/rpiboot
Replies: 28
Views: 4368

3A+ usbboot/rpiboot

Sadly it looks like the 3A+ is unable to support rpiboot by default (which the A+ did).

Are there any hardware modifications that can be made to enable it and if so could the rpiboot tool be updated with support?
by burtyb
Fri Nov 09, 2018 4:06 pm
Forum: HATs and other add-ons
Topic: PoE HAT - USB Ports not working - over-current (FIXED - New Hardware Release)
Replies: 327
Views: 90798

Re: PoE HAT - USB Ports not working - over-current

The_Raven wrote:
Fri Nov 09, 2018 9:08 am
Monday 7. june 2021? :P
Sarcasm OFF ;)
Where Monday = Friday :)

https://www.raspberrypi.org/blog/poe-hat-revision/
by burtyb
Tue Mar 20, 2018 4:29 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B Plus cannot use bridge networking (systemd-networkd)... bug?
Replies: 9
Views: 1721

Re: Raspberry Pi 3 B Plus cannot use bridge networking (systemd-networkd)... bug?

Running Arch ARM (armv7h) on a 3 B Plus and cannot get bridge networking to work (systemd-networkd). Configuring it and rebooting leads it to simple crash on the startup waiting for the network. I had the same problem whilst updating Cluster HAT images (Based on Raspbian) and opened an issue a few ...
by burtyb
Mon Mar 19, 2018 5:31 pm
Forum: Networking and servers
Topic: B+ as 5GHz wifi access point
Replies: 8
Views: 7729

Re: B+ as 5GHz wifi access point

Wiphy phy0 max # scan SSIDs: 10 max scan IEs length: 2048 bytes max # sched scan SSIDs: 16 max # match sets: 16 max # scan plans: 1 max scan plan interval: -1 max scan plan iterations: 0 Retry short limit: 7 Retry long limit: 4 Coverage class: 0 (up to 0m) Device supports T-DLS. Supported Ciphers: ...
by burtyb
Thu Aug 03, 2017 11:56 am
Forum: Bare metal, Assembly language
Topic: Zero USB booting
Replies: 10
Views: 5712

Re: Zero USB booting

Not sure if you're still interested in this but I've got this working on the Cluster HAT and it seems to be quite stable (with over 2000 successful boots) and should also works with just a USB cable connecting the Pi Zero to a Pi 3 for example. I have a guide and an image for download on https://goo...
by burtyb
Thu Jun 22, 2017 1:10 pm
Forum: Networking and servers
Topic: Issues with ISC DHCP server
Replies: 3
Views: 816

Re: Issues with ISC DHCP server

I'm trying to create a wifi extender of sorts and seem to be having some issue with isc DHCP server keeping IP addresses after the device disconnects. If I run arp -a I get a bunch of (192.168.42.16) at <incomplete> on wlan0 when there's nothing connected. Now, this normally wouldn't bother me but ...
by burtyb
Thu Jun 08, 2017 12:25 pm
Forum: Advanced users
Topic: Raspberry Zero: NFS boot
Replies: 4
Views: 3340

Re: Raspberry Zero: NFS boot

If you're happy to connect the Pi Zero as a USB Gadget rather than physical Ethernet you can also use usbboot(rpiboot)+USB Gadget Ethernet+nfsroot (no SD card needed). https://8086.support/content/23/85/en/how-do-i-setup-usbboot-no-sd-cards-in-the-pi-zeros-for-the-cluster-hat.html was my hacked up s...
by burtyb
Tue May 09, 2017 8:57 am
Forum: Other projects
Topic: Desoldering station/gun recommendations
Replies: 3
Views: 810

Re: Desoldering station/gun recommendations

I've been using an S-998P for about 3 years but likely cheaper/better ones out there these days though. I don't do that much desoldering of through hole but when I do I find it really quick/easy to use (I also have a selection of tip sizes) and it does such a good job that after desoldering I've had...
by burtyb
Mon Apr 03, 2017 2:53 pm
Forum: General discussion
Topic: boot on uSD from GPIO
Replies: 3
Views: 547

Re: boot on uSD from GPIO

Any idea if it will work or not ? I made a HAT to access the second interface and it shows up as /dev/blkmmc1, but you won't be able to boot from it by default. https://github.com/raspberrypi/documentation/blob/master/hardware/raspberrypi/bootmodes/bootflow.md gives some hope but I don't know how t...
by burtyb
Sun Mar 19, 2017 2:45 pm
Forum: General discussion
Topic: Possible to read Pi Zero [W] input voltage?
Replies: 12
Views: 4700

Re: Possible to read Pi Zero [W] input voltage?

Hmm, wonder if I can make a variable usb power supply? Might have to cut some tracks :( Need to change voltage to see if the supposed ADC changes. If you're using a v1.3 Cluster HAT (most likely) you can remove the solder link on the top of the board (PWR<>RPi) and solder a connector/wires directly...
by burtyb
Sun Mar 19, 2017 2:01 pm
Forum: General discussion
Topic: Cracks in the Power inductor
Replies: 3
Views: 916

Re: Cracks in the Power inductor

I've lost a corner on one of mine but it seems to be working OK so far.
2017-03-19 13.56.23sm.jpg
2017-03-19 13.56.23sm.jpg (62.28 KiB) Viewed 877 times

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