Raspberry Pi Forums

ejolson

trejan wrote: ↑
Fri Jun 26, 2020 1:57 pm
The bootloader recovery process with a SD card would be able to reset it. The boot ROM inside the SoC always checks for recovery.bin before reading bootcode from EEPROM.

Thanks! That's what I needed to know!

ejolson

I'm reading the documentation https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md on boot order and have understood it is possible to disable SD card boot with a setting such as 0xf2 which presumably means network boot only and keep trying until success, or 0x...

ejolson

Have you noticed any dhcp duplication? Years ago when I experimented with iscsi I found it would randomly fail (nothing being unplugged). The rpi initrd would obtain a lease and when raspbian loaded, another lease would be obtained. I probably messed up the initrd. Too long ago to recall those deta...

ejolson

I didn't realize there was such a thing. current_limit_override=1 According to https://www.tomshardware.com/news/raspberry-pi-higher-overclock,40559.html . What I'm concerned about is that my power supply chip is actually overheating instead of triggering the overcurrent limit, which is what maybe ...

ejolson

One downside to having more memory is a greater chance of a bit flip. My opinion is you don't want to go much beyond 8GB with present technology not having some type of ECC in place. Do you have some real life statistics to back that statement up? Because... Yes, but I accidentally posted it in the...

ejolson

The thing is that under $500 is very different than a $35 Raspberry Pi from a cost opportunity point of view for young people wanting to get started. Raspberry Pi's aren't $35 anymore. ;) Last time I checked the 2GB model was exactly $35. Part of the story about bit-flips in non-ECC memory is summa...

ejolson

Another reason to develop a polished GPU software stack for the Raspberry Pi is for use in teaching concepts and techniques for programming heterogeneous hardware without having to spend the US $75K for an IBM AC922, an NVIDIA DGX A100 or one of the to-be-announced HPE/CRAY systems based on AMD CPU...

ejolson

Last time I did anything (*) with FFTs I found that FFTW running on the ARM was fast enough for my needs and easier to use than the GPU based library. PeterO (*) https://www.youtube.com/watch?v=89fJKpPgAsU While it's possible to do fairly efficient FFTs using NEON on the CPU, the reason to use the ...

ejolson

Perhaps the better approach, now that even a cheap SBC has 8GB, is to allocate the maximum memory required at the start and simplify the code. In any modern system physical memory is allocated on demand. The program reserves some oodles of address space and then the operating system does the physic...

ejolson

The three KVM's and both NAS run Centos btw. Most of my server VM images are Centos also. Bit off-topic but you need to be (at least) running LVM on top of raid1 for the OS in one Volume Group. Use another VG for data, yet another if you desire local backups. Are you running CentOS on the Pi? I'd l...

ejolson

I'm inclined to lock this thread as another pie in the sky wish list. But I really want to know what possible reason the OP can have for needing 32GB of RAM. I seriously doubt that "need" is behind this particular thread. It is much more likely a case of "want" Yes, large amounts of memory are rare...

ejolson

Idle power is 600mA according to https://www.raspberrypi.org/documentation/hardware/raspberrypi/power/README.md Right, and the official FAQ https://www.raspberrypi.org/documentation/faqs/ lists 1.2A average and 1.25A maximum under stress. Similarly, https://www.pidramble.com/wiki/benchmarks/power-c...

ejolson

Following the same procedure for the Zero as previously done for the Pi 4B https://www.raspberrypi.org/forums/viewtopic.php?f=36&t=274553#p1664035 I mounted the iSCSI network block device on /iroot and typed # time rsync -glopqrtxDH --numeric-ids / /iroot real 5m50.833s user 0m52.955s sys 1m41.928s ...

ejolson

Has anyone run cpuburn on a Pi 4B with a quality amp meter connected inline to the 5V (or using a bench power supply) to see how many amperes are actually taken when it's running?

ejolson

running sudo desmg shows many lines of information, which i am not able to reproduce here. However, i found this : sd 0:0:0:0: [sda] Attached SCSI removable disk sd 0:0:0:0: Attached scsi generic sg0 type 0 sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Mode Sense: 03 00 00 00 sd 0:0:0:0:...

ejolson

Woohoo! I now have two Raspberry Pi Zero computers inside the server chassis. The first has an SD card and mounts root from the card. A GPIO output from the first is wired to the run pin of the second which can now be reset as desired. To make things even better, I followed Fido's advice and added a...

ejolson

That means retraining said models, which looks like a bit of a huge problem at the moment. Would it be possible to physically attach a banana to the top of each object you are trying to detect? Not only is training a neural network a difficult problem, but most of the accelerated hardwares designed...

ejolson

With a usb card reader on the RPI and on the tablet. That sounds like the correct approach. It will not automatically mount anything because the partition table is scrambled. What I would do is check with $ sudo dmesg for references to /dev/sda after plugging in the card to the USB card reader. If ...

ejolson

As liberating as the arrival of the personal computers back in the early 70's freeing us from the tyranny of the mainframe group and their batch processing systems. Now, if we could only tame the likes of Google, Facebook, Twitter, et al. I think it's our lot in life that as one unpleasant set of g...

ejolson

Guys, any ideas? I still can’t find out the solution Have you tried unloading and reloading the USB storage module? It may also be possible to issue some sort of USB port reset that allows the drive to reconnect, but I've not experimented how this works on the 4B. An alternative is to create a shut...

ejolson

I have a stack of Pis in a development environment which has one HDMI 10" display. I'd like to be able to switch that display between any one of the Pis while they are running. While I can ssh or VNC into these, I use this setup in environments where there is no availability of wifi or router/hub. ...

ejolson

Hello again, I managed to create a new SD Card with a full instalation. But when I inserted the broken SD Card nothing happened. Does it mean I lost it ? I would much appreciate some tips on what might caused it and if it is somehow recoverable. Thanks in advance Paul Where did you insert the broke...

ejolson

The Surface Pro X shipped last November. ... Dang, I'm out of touch. That thing has built in LTE. Just what I always wanted. Except of course the times when I need an always connected device like that I also need a pile of x86 Windows only configuration tools from various hardware device makers. I ...

ejolson

I think SanDisk may manufacture more than one grade of 32GB SD card. Do you know which SanDisk card you tested?

ejolson

I suspect @ejolson was talking about a kit containing the Pi, PSU, case, etc, rather than a modding kit with the 8 GB RAM chip. Some vendors seemed to have just the board at the beginning. Just checked my two go to suppliers and one only has the official kit with the keyboard, mouse, case, psu and ...

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