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by lingon
Wed Jul 14, 2021 9:49 am
Forum: Troubleshooting
Topic: RPi 4b Overclock the SD Card?
Replies: 7
Views: 427

Re: RPi 4b Overclock the SD Card?

If you want more performance out of your RPi 4B storage then you might replace your uSD-card with an eMMC-module which has significantly better random I/O performance. http://www.uugear.com/product/raspikey-plug-and-play-emmc-module-for-raspberry-pi/ If you want even more performance then you might ...
by lingon
Thu Mar 18, 2021 10:31 am
Forum: General discussion
Topic: Difference between 8G and 4G PI4
Replies: 28
Views: 2755

Re: Difference between 8G and 4G PI4

You could check how much current your SSD is using. If it uses more than the USB 3 port can deliver then it will create problems. This problem has hit me, but there was file system errors given so it helped fixing it. I just used another SSD specified to use less current.
by lingon
Wed Jan 27, 2021 5:05 pm
Forum: General discussion
Topic: Recommended portable USB or HDMI monitor?
Replies: 5
Views: 447

Re: Recommended portable USB or HDMI monitor?

I have a chinese full HD portable 13.3" display from Elecrow bought in the beginning of 2019. Its build quality is not very polished and the screen could be a bit brighter for direct sunshine work, but it is quite useful. The display I have is not IPS, but they have IPS models as well. They hav...
by lingon
Thu Dec 17, 2020 1:49 pm
Forum: General discussion
Topic: Forum Link on Home Page
Replies: 175
Views: 7669

Re: Forum Link on Home Page

I agree with that removing the Forum link on the home page is a bad thing. Also the menu that plops up at the top of the page when you try to change tabs in your browser is extremly distracting and annoying. I hope that these regressions and annoyances can be fixed ASAP.
by lingon
Sun Nov 15, 2020 4:39 pm
Forum: Raspberry Pi 400
Topic: The Raspberry Pi 400 thread!
Replies: 1075
Views: 119838

Re: 23 fun Raspberry Pi 400 facts

The Pi 4B 8GB uses the C0 stepping of the BCM2711 as well. Can you post a photo of Pi 4B 8GB with a C0 stepping of the BCM2711? Can you also post the corresponding output of cat /proc/cpuinfo ? The initial release photo of the Pi 4B 8GB shows a B0 stepping. https://www.raspberrypi.org/app/uploads/2...
by lingon
Sun Oct 25, 2020 11:23 am
Forum: General discussion
Topic: eMMC - What is this for?
Replies: 14
Views: 946

Re: eMMC - What is this for?

eMMC on the CM4 is connected via an 8bit interface where as sdcards connect via a 4 bit interface. So typically eMMC will be faster on a CM4 than an sdcard. It is nice with an 8 bit eMMC interface, because it can double the performance when the drivers support that as well. Based on the plots in th...
by lingon
Fri Oct 23, 2020 8:50 am
Forum: Troubleshooting
Topic: Pi 4B: UVC cameras stop sending frames after random interval
Replies: 14
Views: 1439

Re: Pi 4B: UVC cameras stop sending frames after random interval

Have you read the UVC FAQ at http://www.ideasonboard.org/uvc/faq/? Disabling USB autosuspend, adding quirks or reducing USB bandwidth might be worth trying according to the instructions on that page.
by lingon
Wed Oct 21, 2020 4:38 am
Forum: General discussion
Topic: Need emmc drive
Replies: 26
Views: 2239

Re: Need emmc drive

The microSD and eMMC buses share common roots and are partly similar, so that is why passive adapters can be built to use eMMC modules in a microsSD slot. You cannot reach the highest native eMMC performance speeds with such an adapter, but the random I/O performance is still better than on any micr...
by lingon
Tue Oct 20, 2020 9:44 am
Forum: General discussion
Topic: Need emmc drive
Replies: 26
Views: 2239

Re: Need emmc drive

I was actually hoping for emmc, not sata or m.2. Pre soldered 8GB emmc drives actually work quite well for loading just the os on., with some spare space left for programs. And use the Microsd card for larger program folders (mount /var in there). You can also use eMMC modules with a microSD-eMMC a...
by lingon
Thu Aug 13, 2020 6:58 pm
Forum: General discussion
Topic: Enable the DDR52 mode in the mmcblk driver for eMMC modules with an eMMC-SD adapter
Replies: 3
Views: 843

Re: Enable the DDR52 mode in the mmcblk driver for eMMC modules with an eMMC-SD adapter

Actually I have a USB3.0 SD/uSD card reader which can read with DDR52 speed from an eMMC module when used with an eMMC-uSD adapter, so I don't really see a reason why DDR52 speed would not work on Raspberry Pis.
by lingon
Thu Aug 13, 2020 3:41 pm
Forum: General discussion
Topic: Enable the DDR52 mode in the mmcblk driver for eMMC modules with an eMMC-SD adapter
Replies: 3
Views: 843

Re: Enable the DDR52 mode in the mmcblk driver for eMMC modules with an eMMC-SD adapter

The eMMC and SD-cards share a lot of common technology and this is why it is possible to use an eMMC module as a SD-card with a passive eMMC-SD adapter. From the point of view of the computer host controller it looks like there is a SD-card on the other end. Because the Raspberry Pi 4 B can do UHS D...
by lingon
Thu Aug 13, 2020 2:27 pm
Forum: General discussion
Topic: Enable the DDR52 mode in the mmcblk driver for eMMC modules with an eMMC-SD adapter
Replies: 3
Views: 843

Enable the DDR52 mode in the mmcblk driver for eMMC modules with an eMMC-SD adapter

There are passive eMMC-uSD adapters than might be used on a Raspberry Pi with an eMMC module in the (u)SD-card slot: RasPiKey module http://www.uugear.com/product/raspikey-plug-and-play-emmc-module-for-raspberry-pi/ FriendlyARM eMMC module and adapter https://www.friendlyarm.com/index.php?route=prod...
by lingon
Wed Jul 22, 2020 9:42 am
Forum: General discussion
Topic: Kernel 5.4 vs 4.19: Did you guys noticed Pi runs a bit hotter with 5.4, or is it just me?
Replies: 8
Views: 1181

Re: Kernel 5.4 vs 4.19: Did you guys noticed Pi runs a bit hotter with 5.4, or is it just me?

I can confirm that I have seen a 2-3 °C increase in the idle temperature of my Raspberry Pi 4B 4 GB with kernel 5.4.x. I also experienced the problem of loosing CPU1 with the kernel 5.4.x so I wonder if these two issues are separate or somehow related?
by lingon
Sun Jun 07, 2020 10:09 am
Forum: Troubleshooting
Topic: u-boot port on RaspberryPi 4
Replies: 24
Views: 13878

Re: u-boot port on RaspberryPi 4

Ubuntu is using uboot. In this post it is described how to boot Ubuntu 20.04 on a Raspberry Pi 4 with a patched uboot: viewtopic.php?f=131&t=268476#p1671050
by lingon
Thu Jun 04, 2020 2:35 pm
Forum: General discussion
Topic: Update to default Pi4 bootloader
Replies: 54
Views: 13066

Re: Update to default Pi4 bootloader

Please could you try this potential firmware fix? It's a from a dev branch and is otherwise untested so please backup the card first! release-b5de8c32.zip https://drive.google.com/drive/folders/1ad4FgbZMnTA_kMVq9ZEXlEvVxjeawoJ7?usp=sharing I tried booting from the eMMC module with that release also...
by lingon
Wed Jun 03, 2020 7:00 pm
Forum: General discussion
Topic: Update to default Pi4 bootloader
Replies: 54
Views: 13066

Re: Update to default Pi4 bootloader

The download problem was due to too strict cookie settings. I installed that release and the Raspberry Pi 4 cold boots and reboots fine with it from the eMMC module. vcgencmd version Jun 3 2020 13:08:21 Copyright (c) 2012 Broadcom version b5de8c32f4f45a12a1fdfe107254df82965f9d56 (clean) (release) (...
by lingon
Wed Jun 03, 2020 4:22 pm
Forum: General discussion
Topic: Update to default Pi4 bootloader
Replies: 54
Views: 13066

Re: Update to default Pi4 bootloader

The download problem was due to too strict cookie settings. I installed that release and the Raspberry Pi 4 cold boots and reboots fine with it from the eMMC module. vcgencmd version Jun 3 2020 13:08:21 Copyright (c) 2012 Broadcom version b5de8c32f4f45a12a1fdfe107254df82965f9d56 (clean) (release) (s...
by lingon
Wed Jun 03, 2020 3:19 pm
Forum: General discussion
Topic: Update to default Pi4 bootloader
Replies: 54
Views: 13066

Re: Update to default Pi4 bootloader

Is that link supposed to be public? I don't get the zip-file and the page prompts for a password.
by lingon
Wed May 27, 2020 7:35 pm
Forum: Ubuntu
Topic: SSD pi 4 boot beta applied - now: how to prepare ubuntu 20.04
Replies: 4
Views: 3606

Re: SSD pi 4 boot beta applied - now: how to prepare ubuntu 20.04

It can be done as is discussed in this thread https://www.raspberrypi.org/forums/viewtopic.php?f=131&t=268476 , but at the moment it is a hack involving error prone manual work. And whenever the kernel is updated it needs to be decompressed manually. After flashing the USB MSD capable eeprom boo...
by lingon
Tue May 26, 2020 3:17 pm
Forum: Ubuntu
Topic: Ubuntu from SSD - easy method
Replies: 21
Views: 15723

Re: Ubuntu from SSD - easy method

Has anyone running from a SSD encountered this error message? blk_update_request I/O err dev sda I tested the SSD several times and found no errors on it. By booting Ubuntu 20.04 into single user mode I was able to work around the errors that put the filesystem into a read only mode and install all ...
by lingon
Mon May 25, 2020 7:40 am
Forum: Ubuntu
Topic: Ubuntu from SSD - easy method
Replies: 21
Views: 15723

Re: Ubuntu from SSD - easy method

In the end I managed to get Ubuntu 20.04 booting from my SSD. My 500 GB Crucial BX 100 SSD is already quite old, but so far it has never given any I/O errors. It run without problems with Raspbian when I tested it shortly, but now I get some nasty timeouts and errors which slow down the boot of the ...
by lingon
Sun May 24, 2020 8:51 pm
Forum: Ubuntu
Topic: Ubuntu from SSD - easy method
Replies: 21
Views: 15723

Re: Ubuntu from SSD - easy method

The vmlinuz Aarch64 kernel is gzip compressed. Uncompressing it and booting the uncompressed kernel did not improve this.
My serial-USB cable has not yet given any output, but if the problem is before the kernel boots then it is expected.
by lingon
Sun May 24, 2020 4:55 pm
Forum: Ubuntu
Topic: Ubuntu from SSD - easy method
Replies: 21
Views: 15723

Re: Ubuntu from SSD - easy method

I did try this on a Raspberry Pi 4. It gets as far as to the rainbow screen where it hangs with only a SSD attached. Before that the USB-SSD enclosure status LED clearly blinks for a brief moment, so it is accessing the USB bus. I'll try to see if the serial console has some hints about what is fail...
by lingon
Fri May 22, 2020 2:11 pm
Forum: General discussion
Topic: Raspberry Pi 4 USB mass storage beta (beta means it not ready yet, and not officially released!)
Replies: 282
Views: 132819

Re: Raspberry Pi 4 USB mass storage beta

I had used quite a few of the previous eeprom beta versions, so initially my Raspberry Pi 4 was doing a SD-boot and then trying to infinitely do a PXE boot. I set explicitly NET_BOOT_MAX_RETRIES=0 in the boot configuration file and flashed the eeprom once more. After doing that I got the USB MSD boo...
by lingon
Fri May 15, 2020 5:39 pm
Forum: General discussion
Topic: Update to default Pi4 bootloader
Replies: 54
Views: 13066

Re: Update to default Pi4 bootloader

The eMMC module is discussed in this thread: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=248157&hilit=emmc . It is this module: https://www.friendlyarm.com/index.php?route=product/product&product_id=249 . It got stuck on the rainbow screen without any diagnostics. I flashed o...

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