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by pica200
Fri Feb 14, 2020 10:09 pm
Forum: General discussion
Topic: Why since DVFS firmware can I reboot at a higher arm_freq than from a cold boot?
Replies: 13
Views: 791

Re: Why since DVFS firmware can I reboot at a higher arm_freq than from a cold boot?

That doesn't mean anything as do synthetic benchmarks. Try the unsharpen filter with 2 GHz in Gimp on a large picture like the ones Raspbian comes with (backgrounds) and you will see what i mean.

I didn't notice any stability problems on cold boot with newest firmware.
by pica200
Fri Feb 14, 2020 4:57 pm
Forum: General discussion
Topic: Why since DVFS firmware can I reboot at a higher arm_freq than from a cold boot?
Replies: 13
Views: 791

Re: Why since DVFS firmware can I reboot at a higher arm_freq than from a cold boot?

2 GHz has been working since Pi 4 launch but it was and never will be 100% stable because of the PMIC.

The problems on reboot could be related to the recent bugs. Try fully updating Raspbian.
by pica200
Wed Feb 12, 2020 9:07 pm
Forum: Troubleshooting
Topic: Issues since kernel got updated to 4.19.93
Replies: 162
Views: 20908

Re: Issues since kernel got updated to 4.19.93

I can understand the frustration from some people but it could be much worse (data loss, bricks...). The world is not gonna end because of a few bugs. They are trying to cater for many different people with a small team and stuff happens. Recover your backup and wait for the fixes or modify config.t...
by pica200
Tue Feb 11, 2020 10:33 pm
Forum: Troubleshooting
Topic: Issues since kernel got updated to 4.19.93
Replies: 162
Views: 20908

Re: Issues since kernel got updated to 4.19.93

dom wrote:
Tue Feb 11, 2020 9:50 pm
Rather the reverting the commit it attempts to make it safe.
That means we still have the fix for gpu overclock settings causing a failure to boot.
Can you elaborate? It would be a shame if the GPU overclock fix causes problems for everyone else and must be reverted :(
by pica200
Tue Feb 11, 2020 4:53 pm
Forum: General discussion
Topic: Reasoning behind dual Micro HDMI, and potential future alternatives?
Replies: 125
Views: 15025

Re: Reasoning behind dual Micro HDMI, and potential future alternatives?

I personally would like mini DisplayPort. It's more robust than micro HDMI and i already had an adapter for the old HDMI-only monitor i use. Many newer monitors will accept DisplayPort or even USB C. For the future USB C is probably a better choice since it's gaining popularity quickly but it requir...
by pica200
Sat Feb 08, 2020 11:50 am
Forum: Advanced users
Topic: Cant Overclock?
Replies: 27
Views: 3886

Re: Cant Overclock?

There is a new firmware update in the pipeline which will fix the freeze on boot if core_freq is set too high (gpu_freq is an alias for multiple options) and it allows higher v3d_freq which is probably what you are after. Keep in mind overclocking the GPU is not helpful in most cases except when it ...
by pica200
Sat Feb 08, 2020 1:11 am
Forum: Advanced users
Topic: DVFS Firmware
Replies: 89
Views: 17259

Re: DVFS Firmware

The new firmware has been pushed. It will take a while to make it into stable (and hopefully it doesn't set any house on fire in the meantime) but it's worth the wait! It's probably already available via rpi-update for the impatient. As mentioned in my tests the highest you can go now with all but c...
by pica200
Thu Feb 06, 2020 3:30 pm
Forum: General discussion
Topic: RPi Benchmarks: 32- Vs 64-bits article on HaD
Replies: 59
Views: 4584

Re: RPi Benchmarks: 32- Vs 64-bits article on HaD

It's a mixed bag. 64 bit will be faster in most cases but it will bottleneck with RAM intense applications because of the single channel RAM with 32 bit bus. A bigger L2 cache may help but it's a question of costs. SRAM is very expensive.
by pica200
Wed Feb 05, 2020 4:51 pm
Forum: Advanced users
Topic: DVFS Firmware
Replies: 89
Views: 17259

Re: DVFS Firmware

Leaving this here too (also see the following comments): https://github.com/raspberrypi/firmware/issues/1290#issuecomment-582410092 With this new firmware we can go even higher than previously! But don't party yet because testing is still ongoing. This firmware may burn you house down and kills your...
by pica200
Wed Feb 05, 2020 3:09 pm
Forum: Gaming
Topic: How to setup Dolphin on a Pi 4 with Raspbian Buster
Replies: 32
Views: 29656

Re: How to setup Dolphin on a Pi 4 with Raspbian Buster

I figured this news is worth posting. If there is no other issue with this new firmware we are one step closer to proper GC emulation:

Also see the comments below this one.
https://github.com/raspberrypi/firmware ... -582410092
by pica200
Mon Jan 06, 2020 3:27 pm
Forum: Gaming
Topic: How to setup Dolphin on a Pi 4 with Raspbian Buster
Replies: 32
Views: 29656

Re: How to setup Dolphin on a Pi 4 with Raspbian Buster

Just something to note: The new CPU scaling does impact performance negatively (several frames in a few cases). To fix that set the scaling governor to performance and it is back to normal (but watch the temps since it's running fullspeed permanently).
by pica200
Thu Dec 26, 2019 10:08 pm
Forum: Advanced users
Topic: DVFS Firmware
Replies: 89
Views: 17259

Re: DVFS Firmware

Regarding stability: Everything with overvolt higher than 2 and ARM freq higher 1.8 GHz is only semi-stable (no guarantee though). You can test this easily if you use the unsharpen filter in Gimp on large jpg files. It will brownout and reboot if you go too high. There are probaboy other specific in...
by pica200
Tue Dec 24, 2019 3:35 pm
Forum: Advanced users
Topic: Overclocking broken
Replies: 6
Views: 1591

Re: Overclocking broken

Pretty sure this is because of the new dvfs firmware. A temporary workaround: https://github.com/raspberrypi/firmware ... -557923066
by pica200
Tue Dec 24, 2019 3:32 pm
Forum: Troubleshooting
Topic: RPi 4 unable to connect to WiFi [solved]
Replies: 56
Views: 85622

Re: RPi 4 unable to connect to WiFi [solved]

If the range allows it definitely use 5 GHz. It's far better than the oversaturated 2.4 GHz band at the cost of some range.

And yeah, this is known and mostly caused by badly shielded HDMI cables.
by pica200
Wed Dec 18, 2019 2:14 am
Forum: General discussion
Topic: Pi4 Cooling
Replies: 116
Views: 18390

Re: Pi4 Cooling

the thermals are worse definitly than the 3b+, i ran mine with a C-size battery with the flat end on the cpu with some thermal paste and it worked fine (until it tiped over and shorted the GPIO pins, that is, don't try that at home for your own sake, lol) Wait what? Did you really just use a batter...
by pica200
Tue Dec 17, 2019 9:54 am
Forum: General discussion
Topic: Raspberry Pi 3B+ and arm processor security
Replies: 9
Views: 904

Re: Raspberry Pi 3B+ and arm processor security

Yeah, this only becomes a problem when EL2 or 3 are used. Until then nothing to worry about. A hypervisor could be compromised this way.
by pica200
Fri Dec 13, 2019 7:05 pm
Forum: General discussion
Topic: Raspberry Pi 3B+ and arm processor security
Replies: 9
Views: 904

Re: Raspberry Pi 3B+ and arm processor security

When you already have EL1 privileges (kernel) you can do everything you want anyway including manipulating the files on the boot partition. Everything higher than EL1 is not used as far as i know and there is no chain of trust at all. So it's not very secure in the first place.
by pica200
Mon Dec 02, 2019 12:34 pm
Forum: Troubleshooting
Topic: RPi 4 unable to connect to WiFi [solved]
Replies: 56
Views: 85622

Re: [solved] RPi 4 unable to connect to WiFi

Maybe this should be moved to a new thread. This sounds to me like the driver for the WiFi and Bluetooth combi is going nuts or the firmware of it. Edge case with non-standard conform router?
by pica200
Sat Nov 30, 2019 10:13 am
Forum: General discussion
Topic: sudo rpi-update - broke my overclock PI4B
Replies: 12
Views: 1516

Re: sudo rpi-update - broke my overclock PI4B

It's not meant as a limitation (even if it looks like one). It's just incompatible with the DVFS firmware for now and hopefully that will be solved in the future. It's low priority but can't blame them for that.
by pica200
Sat Nov 30, 2019 1:45 am
Forum: Bare metal, Assembly language
Topic: Learning ARM Assembler
Replies: 7
Views: 1464

Re: Learning ARM Assembler

I got into ARM asm with this. It's not for the Pi and very oldschool but gives you an idea about the basics:

http://www.coranac.com/tonc/text/asm.htm

Happy reading ;)
by pica200
Sat Nov 30, 2019 1:08 am
Forum: Advanced users
Topic: Does 1750Mhz need overvoltage and a fan?
Replies: 8
Views: 932

Re: Does 1750Mhz need overvoltage and a fan?

To give you an idea: For 1.8 GHz you need over_voltage=2. That's right on the limit of my SoC and going 50 MHz higher makes it kernel panic at boot. Temperature is a bit higher but not by much. Warranty is only voided if you both overvolt and use the force_turbo=1 option. But you can archive basical...
by pica200
Fri Nov 29, 2019 1:51 pm
Forum: General discussion
Topic: sudo rpi-update - broke my overclock PI4B
Replies: 12
Views: 1516

Re: sudo rpi-update - broke my overclock PI4B

Try adding "core_freq=500" to your config.txt as popcornmix described here: https://github.com/raspberrypi/firmware ... -557923066

Folr me this worked and doesn't seem to make it less stable.
by pica200
Mon Nov 25, 2019 11:07 am
Forum: Advanced users
Topic: DVFS Firmware
Replies: 89
Views: 17259

Re: DVFS Firmware

That's good to hear. Maybe someone knowledgeable wants to explain why it suddenly works increasing core_freq.
by pica200
Sun Nov 24, 2019 10:52 pm
Forum: Advanced users
Topic: DVFS Firmware
Replies: 89
Views: 17259

Re: DVFS Firmware

You must have been lucky for yours to boot at all. Maybe core_freq=500 fixes the freezes for you?

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