Go to advanced search

by dickon
Fri Nov 15, 2019 12:46 am
Forum: General discussion
Topic: Storage-addressing limits on 4GB Raspberry Pi 4 Model B?
Replies: 5
Views: 188

Re: Storage-addressing limits on 4GB Raspberry Pi 4 Model B?

I have a 6TB external USB 3.0 hard drive with a single NTFS partition that works just fine when directly connected to a computer, but if I plug it into my Netgear router's USB 3.0 "network storage" port, the router can't reliability read and manage it. The Pi3B has a "gigabit" Ethernet port, but ac...
by dickon
Thu Nov 14, 2019 10:52 pm
Forum: Advanced users
Topic: Pi4 64-bit raspbian kernel for testing - Focus on Pi4
Replies: 243
Views: 38342

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

ZFS came from Solaris, and 64b Solaris at that. The Solaris kernel uses 64b virtual addressing extensively, which the Linux kernel does not, and as such, ZFS isn't really suited for 32b operation. You probably ran out of address space, which is easily done these days on a 32b system.
by dickon
Tue Nov 12, 2019 12:19 am
Forum: General discussion
Topic: Thinking about getting RPi 4 vs AWS
Replies: 19
Views: 529

Re: Thinking about getting RPi 4 vs AWS

A Pi0 won't do 4k H.265 Neither will a throttling Pi4b It'll certainly drive a 4k display, which a P0 won't. I've also seen no evidence that a throttled P4 won't do 4K H.265: the limiting factor seems to be the CPU, which the decode blocks don't make much use of. The Pi4b has been consistently show...
by dickon
Mon Nov 11, 2019 9:00 pm
Forum: General discussion
Topic: Thinking about getting RPi 4 vs AWS
Replies: 19
Views: 529

Re: Thinking about getting RPi 4 vs AWS

Why buy a Pi4 if you're fine with it throttling? Because the vast majority of the time, it doesn't. You'll find most x86 machines will do the same, unless you've splashed out for an upgraded cooler. A throttling Pi is equivalent to a slower model Pi and for less money you could get a Pi Zero W that...
by dickon
Mon Nov 11, 2019 4:51 pm
Forum: General discussion
Topic: Thinking about getting RPi 4 vs AWS
Replies: 19
Views: 529

Re: Thinking about getting RPi 4 vs AWS

In my experience, uSD cards have roughly the same reliability as USB sticks, so you may as well not bother. But yes, you can use non-SD card storage for the OS and data. At present, the Pi 3 can boot from USB, but the Pi 4 cannot; this is being worked on but is 'some months' away (see the topic on t...
by dickon
Mon Nov 11, 2019 2:42 pm
Forum: General discussion
Topic: Thinking about getting RPi 4 vs AWS
Replies: 19
Views: 529

Re: Thinking about getting RPi 4 vs AWS

The Pi 4 can get hot, although recent EEPROM images seem to have helped that. It'll just throttle, though. I would (strongly) recommend using the uSD card for /boot only, and keeping all other data -- OS and user files -- on some other storage. Personally, I do everything over the network, but as yo...
by dickon
Mon Nov 11, 2019 2:26 pm
Forum: General discussion
Topic: Thinking about getting RPi 4 vs AWS
Replies: 19
Views: 529

Re: Thinking about getting RPi 4 vs AWS

My Pi 4 doesn't, but then it's mostly idle. When it isn't idle, it's playing video, and it handles that without sweating. The Pi 3 B+ I have in the loft does, but only when the ambient temperature gets into the 40s in summer. It's now PoE-powered, and the HAT has a fan on it, which helps. Again, tho...
by dickon
Mon Nov 11, 2019 1:21 pm
Forum: General discussion
Topic: Thinking about getting RPi 4 vs AWS
Replies: 19
Views: 529

Re: Thinking about getting RPi 4 vs AWS

With decent storage and power, they're rock solid.
by dickon
Sun Nov 10, 2019 3:55 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 411
Views: 89509

Re: Raspberry Pi 4 usb boot?

Two minutes of Googling found http://elm-chan.org/fsw/ff/00index_e.html which looks as if it'll do the trick, isn't GPL, and looks to be current. Bonus: designed for embedded systems, so minimally RO compiles to ~4k ARMv7, and requires a trivial set of IO primitives. I'm sure there will be others ou...
by dickon
Fri Nov 08, 2019 8:31 pm
Forum: Advanced users
Topic: Pi4 64-bit raspbian kernel for testing - Focus on Pi4
Replies: 243
Views: 38342

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

Gods...

No.

Do:

Code: Select all

chroot $foo
mount -t proc proc /proc
mount -t sysfs sys /sys
mount -t devtmpfs udev /dev
mount -t devpts devpts /dev/pts
or similar. There may be some I've missed.

Some people prefer to bind mount from the root filesystem. It's personal preference.
by dickon
Wed Nov 06, 2019 11:25 pm
Forum: General discussion
Topic: Interesting interview with Eben in Physics World
Replies: 41
Views: 1468

Re: Interesting interview with Eben in Physics World

Anyone got anything to say about the actual article? Or just going to whitter on about the GPIO headers? Probably the latter, but yes, it was a very interesting interview. FWLIW, the commercial uses of the Pi that I've seen all involve the GPIO header, and I'm very, very glad it's there. I'm also u...
by dickon
Wed Nov 06, 2019 10:33 pm
Forum: General discussion
Topic: GPIOs working in parallel
Replies: 5
Views: 207

Re: GPIOs working in parallel

It would be pretty useless if you couldn't...
by dickon
Wed Nov 06, 2019 5:05 pm
Forum: General discussion
Topic: Interesting interview with Eben in Physics World
Replies: 41
Views: 1468

Re: Interesting interview with Eben in Physics World

As would the rest of the SBC space. It's remarkable just how many of them come with a 40-pin header with GPIO on it. All mutually incompatible, of course, and nothing else has anywhere near the userbase or support of the Pi, but still. GPIO is a thing that's out there, mostly because of the Pi. It's...
by dickon
Tue Nov 05, 2019 11:02 pm
Forum: Advanced users
Topic: Cache speed vs main memory speed - calculating on the fly vs huge lookup tables
Replies: 5
Views: 235

Re: Cache speed vs main memory speed - calculating on the fly vs huge lookup tables

I wish you the best of luck -- it sounds facinating -- but it's probably best suited to the bare-metal section, no? You're never going to be in a position to guarantee anything useful under a general OS like Linux. That said, people have had success with hard-RT problems pinning processes to certain...
by dickon
Tue Nov 05, 2019 10:21 pm
Forum: Advanced users
Topic: Cache speed vs main memory speed - calculating on the fly vs huge lookup tables
Replies: 5
Views: 235

Re: Cache speed vs main memory speed - calculating on the fly vs huge lookup tables

What on earth are you trying to do?

Your signature seems the best point to start from, if you ask me...
by dickon
Mon Nov 04, 2019 7:14 pm
Forum: General discussion
Topic: Nightly email hints at trouble to come...
Replies: 5
Views: 298

Re: Nightly email hints at trouble to come...

Updates write system files, of course. But rarely: you don't upgrade much of a system at any given update, and you'll soon see any corruption. Erase blocks are a good point. I thought most SD cards were still on 8k. Either way: move to a file server with proper SSDs. And mirror them. With a checksum...
by dickon
Mon Nov 04, 2019 4:41 pm
Forum: General discussion
Topic: Nightly email hints at trouble to come...
Replies: 5
Views: 298

Re: Nightly email hints at trouble to come...

The installed packages are likely to be fine, as once written, they remain untouched. Your collected data is going to be at risk here, and I'd check the integrity of that ASAP, then back it all up somewhere safe. Rebuilding a clone isn't hard. You can use the tried and trusted dpkg --get-selections ...
by dickon
Sat Nov 02, 2019 4:12 pm
Forum: Raspbian
Topic: experimental support for multiarch with Raspbian and Debian arm64
Replies: 22
Views: 2588

Re: experimental support for multiarch with Raspbian and Debian arm64

arm64 raspberrypi-sys-mods is now in the repo. Looks like I need the same for libraspberrypi-bin and raspberrypi-bootloader, but I can't see any upstream packaging tools for them. The repo at https://github.com/raspberrypi/firmware is the one mentioned as source for libraspberrypi-bin, but doesn't ...
by dickon
Sat Nov 02, 2019 3:45 pm
Forum: Advanced users
Topic: rpi-eeprom beta package - VL805 updates
Replies: 49
Views: 4750

Re: rpi-eeprom beta package - VL805 updates

Hi. Wouldn't sudo rpi-update do the job? Or is it still not recommended to use that old hack? [I mean... I love to do the contrary of what it's written: it doubles the fun ;) ] With the Pi 4, we now have two things that are broadly considered 'firmware': the old start*.elf, bootcode.bin, and whatno...
by dickon
Sat Nov 02, 2019 10:38 am
Forum: Advanced users
Topic: rpi-eeprom beta package - VL805 updates
Replies: 49
Views: 4750

Re: rpi-eeprom beta package - VL805 updates

It is, just use the USE_FLASHROM option. Works for me.
by dickon
Fri Nov 01, 2019 12:48 pm
Forum: Advanced users
Topic: Pi4 64-bit raspbian kernel for testing - Focus on Pi4
Replies: 243
Views: 38342

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

dmesg has a limited buffer which makes it unsuitable for that sort of thing. You can trivially grep the 'CPU architecture' field of /proc/cpuinfo ('7' for 32b on a Pi 3B, '8' for the 64b kernel), however.
by dickon
Thu Oct 31, 2019 10:05 pm
Forum: General discussion
Topic: Pi 4 Network Boot
Replies: 2
Views: 243

Re: Pi 4 Network Boot

Yup. Works well.

What are you having trouble with?
by dickon
Thu Oct 31, 2019 9:28 pm
Forum: General discussion
Topic: IP address tracer?
Replies: 9
Views: 651

Re: IP address tracer?

nmap looks good, but there's so many commands and I can't seem to find one that does what I want. All I really need to know is the devices that are on the same wifi as my pi. The only device(s) on the network with that knowledge are the wifi AP(s), and even then, if you have multiple APs, they'll o...
by dickon
Wed Oct 30, 2019 9:41 pm
Forum: Advanced users
Topic: i2c user permission
Replies: 14
Views: 9359

Re: i2c user permission

And chmod 660, not 666. 666 allows anyone to access it.

Go to advanced search