Go to advanced search

by timg236
Wed Jul 29, 2020 9:03 am
Forum: General discussion
Topic: pxe boot raspberry pi 4 with windows dhcp server.
Replies: 20
Views: 717

Re: pxe boot raspberry pi 4 with windows dhcp server.

Network boot on the Raspberry Pi uses a very small subset of PXE to discover the IP address of the TFTP server but that's as far as PXE support goes. That's just DHCP. That's not PXE-specific. PXE is a very, very specific set of real-mode x86 and DHCP client options, with a proxy thrown in the mix ...
by timg236
Wed Jul 29, 2020 8:27 am
Forum: General discussion
Topic: pxe boot raspberry pi 4 with windows dhcp server.
Replies: 20
Views: 717

Re: pxe boot raspberry pi 4 with windows dhcp server.

Network boot on the Raspberry Pi uses a very small subset of PXE to discover the IP address of the TFTP server but that's as far as PXE support goes. For historical reasons, the architecture has always been advertised as X86 and that's baked into the Pi3 ROM so changing it in future bootloaders woul...
by timg236
Tue Jul 28, 2020 3:17 pm
Forum: General discussion
Topic: Raspberry PI 4 and wifi pineapple
Replies: 17
Views: 698

Re: Raspberry PI 4 and wifi pineapple

Locked: It would be better to discuss this on the WiFi Pineapple websites.
by timg236
Wed Jul 22, 2020 6:46 pm
Forum: General discussion
Topic: Recommendations for USB SATA adaptor for booting from SSD
Replies: 29
Views: 1799

Re: Recommendations for USB SATA adaptor for booting from SSD

There are lots of positive reports on the forums for adapters with ASMedia USB SATA chips
by timg236
Tue Jul 21, 2020 7:05 am
Forum: Beginners
Topic: New Raspberry Pi OS for USB-boot on Pi 4 ?
Replies: 24
Views: 1754

Re: New Raspberry Pi OS for USB-boot on Pi 4 ?

There aren't any
by timg236
Tue Jul 21, 2020 6:50 am
Forum: Beginners
Topic: New Raspberry Pi OS for USB-boot on Pi 4 ?
Replies: 24
Views: 1754

Re: New Raspberry Pi OS for USB-boot on Pi 4 ?

We've started releasing Raspberry Pi OS test images which contain the latest versions of the APT packages plus rpi-update kernel and firmware. The images can be installed via your usual disk imager program. Hopefully, this should make it easier for non-expert users to try an experimental OS release ...
by timg236
Thu Jul 16, 2020 2:42 pm
Forum: Advanced users
Topic: Raspberry Pi 4 VL805 firmware release 0138a1
Replies: 35
Views: 10677

Re: Raspberry Pi 4 VL805 firmware release 0138a1

The APT update was pushed earlier and should be visible in later today
by timg236
Thu Jul 16, 2020 10:54 am
Forum: Troubleshooting
Topic: RPi 4 network boot fails when connected through Cisco switch
Replies: 2
Views: 128

Re: RPi 4 network boot fails when connected through Cisco switch

You probably need a full packet capture from the Pi, I suspect the Cisco switch is causing packets to be lost so the request for the correct DTB file fails and start.elf starts working through alternate DTBs in turn
by timg236
Wed Jul 15, 2020 9:56 am
Forum: General discussion
Topic: How can I read OTP bits?
Replies: 21
Views: 801

Re: How can I read OTP bits?

Write protecting the two EEPROMs involves software and hardware changes. You need to set some bits in the EEPROM status register to protect the EEPROM contents and also the status register itself. The /WP pin needs to be pulled low to disable the ability to change the status register. You need to s...
by timg236
Wed Jul 15, 2020 9:48 am
Forum: General discussion
Topic: How can I read OTP bits?
Replies: 21
Views: 801

Re: How can I read OTP bits?

Please see the following post for details of an alpha-test version of the bootloader + recovery.bin can be configured (via config.txt) to set/clear WP status on both EEPROMS. https://github.com/raspberrypi/documentation/issues/1302#issuecomment-658411237 Read all of the post and release notes before...
by timg236
Tue Jul 14, 2020 8:44 pm
Forum: General discussion
Topic: How can I read OTP bits?
Replies: 21
Views: 801

Re: How can I read OTP bits?

If you are planning on using Raspberry Pis in a server environment then the OS should be configured to avoid unrestricted access i.e. not root or the pi user. The Linux kernel / root has full access to all hardware registers including OTP, PMIC etc. The firmware provides safe APIs for setting rows e...
by timg236
Fri Jul 10, 2020 8:47 pm
Forum: Advanced users
Topic: RPi4 Netboot - DHCP option 93
Replies: 6
Views: 348

Re: RPi4 Netboot - DHCP option 93

Please can you raise an rpi-eepom Github issue describing exactly what DHCPconfigurations are affected by this? The PXE protocol in Raspberry Pi network boot is only used as a convenient method for discovering the appropriate DHCP server, there's no intention to actually do PXE so it's not clear why...
by timg236
Fri Jul 10, 2020 8:40 pm
Forum: General discussion
Topic: RPI4 USB MSD maximum GPT partitions
Replies: 5
Views: 436

Re: RPI4 USB MSD maximum GPT partitions

It's just a limitation of the way a load of old code is structured and re-writing that to support everything that GPT allows is not a priority. For multiple OS's you might find the os_prefix option in config.txt a better method https://www.raspberrypi.org/documentation/configuration/config-txt/boot.md
by timg236
Fri Jul 10, 2020 7:48 pm
Forum: Bare metal, Assembly language
Topic: LCD Splash Screen
Replies: 4
Views: 509

Re: LCD Splash Screen

You'll need to contact the display manufacturer, the bootloader doesn't initialise the HDMI block if DISABLE_HDMI=1 and there are no DPI or DSI drivers in the bootloader.
by timg236
Fri Jul 10, 2020 8:07 am
Forum: General discussion
Topic: Updated raspi-config - Boot Eeprom options
Replies: 18
Views: 1075

Re: Updated raspi-config - Boot Eeprom options

Probably best to discuss improvements via a Github PR eg interaction with beta release if you think that’s a major problem.
However; as already stated if you know enough to install beta releases you don’t need this UI
by timg236
Thu Jul 09, 2020 10:29 am
Forum: General discussion
Topic: RPI4 USB MSD maximum GPT partitions
Replies: 5
Views: 436

Re: RPI4 USB MSD maximum GPT partitions

Yep, don't do that :)

start.elf and more importantly the ROM (for recovery.bin) require the boot partition to be in one of the first 8 FAT/EFI partitions (skipping over unrecognised partition types).Similarly, make sure the boot partition is within the first 2TB
by timg236
Thu Jul 09, 2020 9:23 am
Forum: General discussion
Topic: Updated raspi-config - Boot Eeprom options
Replies: 18
Views: 1075

Re: Updated raspi-config - Boot Eeprom options

The raspi-config options are there to provide an easy mechanism for non-expert users (who aren't interested in bootloaders) to do the following tasks Revert to factory defaults - equivalent to the Raspberry Pi Imager EEPROM rescue Enable network boot e.g. for a PiServer classroom environment Switch ...
by timg236
Thu Jul 09, 2020 9:02 am
Forum: Advanced users
Topic: Network (Ethernet) Boot for Pi4
Replies: 13
Views: 2159

Re: Network (Ethernet) Boot for Pi4

Network boot was out of beta back in September - USB boot will be out of beta in the next few weeks. Obviously, there will be more bugs to fix and subsequent releases still go through beta->stable->production (+ critical updates). If you want to use the 'self-update' mode for the bootloader with net...
by timg236
Thu Jul 09, 2020 8:57 am
Forum: Advanced users
Topic: USB Boot xHC-CMD err
Replies: 1
Views: 170

Re: USB Boot xHC-CMD err

Update to the latest beta release of the bootloader
by timg236
Wed Jul 08, 2020 3:47 pm
Forum: General discussion
Topic: STICKY: USB-MSD boot EEPROM fourth update - 2020-06-15
Replies: 193
Views: 32023

Re: STICKY: USB-MSD boot EEPROM fourth update - 2020-06-15

Locking thread now that the 2020-06-15 EEPROM has been moved to stable and there is also a minor beta update 2020-07-06. The thread has also diverged away from bootloader specific issues and it would be clearer to have different threads specific to a particular area e.g. UASP, general firmware chang...
by timg236
Wed Jul 08, 2020 3:28 pm
Forum: General discussion
Topic: Videos show as green and pixelated in Chromium using Raspberry Pi 4 8GB
Replies: 10
Views: 380

STICKY: USB-MSD boot EEPROM fourth update - 2020-06-15

I did roll back the firmware to the released version using sudo apt install --reinstall libraspberrypi0 libraspberrypi-{bin,dev,doc} raspberrypi-bootloader raspberrypi-kernel , see https://www.raspberrypi.org/documentation/raspbian/applications/rpi-update.md. This improved the situation on video so...
by timg236
Wed Jul 08, 2020 1:31 pm
Forum: General discussion
Topic: Videos show as green and pixelated in Chromium using Raspberry Pi 4 8GB
Replies: 10
Views: 380

Re: STICKY: USB-MSD boot EEPROM fourth update - 2020-06-15

This video problem is perhaps related to: "Since the GPU firmware must also be upgraded USB-MSD boot as a feature is still viewed as beta software." Almost certainly not. It would be best to pursue your issue in another section of the forum. Indeed, the rule of thumb is that anything after kernel s...
by timg236
Tue Jul 07, 2020 1:40 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 Green light no boot
Replies: 9
Views: 288

Re: Raspberry Pi 4 Green light no boot

It might also be worth trying the beta recovery.bin from https://github.com/raspberrypi/rpi-eeprom/tree/master/firmware/beta in-case because that has various diagnostic improvements from USB MSD development. Just copy recovery.bin from Github over the file on the sd-card created by the Raspberry Pi ...
by timg236
Tue Jul 07, 2020 12:40 pm
Forum: General discussion
Topic: USB device boot mode for RPI4
Replies: 21
Views: 1013

Re: USB device boot mode for RPI4

If you have a logic analyser .... Before you start modding the board it might be worth trying an SD breakout board to see what's happening with the SD interface https://proto-pic.co.uk/product/breakout-board-for-microsd-transflash/ The ROM always tries the SD card first so it would be interesting to...
by timg236
Tue Jul 07, 2020 12:32 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 Green light no boot
Replies: 9
Views: 288

Re: Raspberry Pi 4 Green light no boot

The current production recovery.bin (updated when HDMI diagnostics were released) enables UART output if the image file is pieeprom.bin. If it is pieeprom.upd then the UART is not enabled because that's assumed to be an automatic update.

Adding uart_2ndstage=1 works on older versions as well

Go to advanced search