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by datajerk
Sat Aug 15, 2020 7:46 pm
Forum: General discussion
Topic: RPi4 USB Boot - Increased system load and green LED always on
Replies: 6
Views: 770

Re: RPi4 USB Boot - Increased system load and green LED always on

I'm USB booting Ubuntu 20.04 with a JMicron NVMe adapter I've been testing for the last year as non-boot storage (Realtek RTL9210 in the mail). Green light on most of the time. Loadavg is around 0.90 - 1.0. I've run iozone3 and HPL benchmarks without issue. I did not create baselines using sdcard bo...
by datajerk
Tue Nov 01, 2016 5:56 pm
Forum: General discussion
Topic: STICKY: USB boot now working on Pi3
Replies: 544
Views: 356875

Re: USB boot now working on Pi3

Hi, assuming I have a bootable USB mass storage device AND a bootable sd card inserted, is there a setting which device will be preferred for booting? Thanks Search back a few posts in the thread. I have the same question. Here's what I know so far: This document implies that with the correct OTP s...
by datajerk
Fri Oct 07, 2016 8:34 pm
Forum: General discussion
Topic: STICKY: USB boot now working on Pi3
Replies: 544
Views: 356875

Re: USB boot now working on Pi3

You could mimic what the compute module does to disable boot from emmc ie disconnect the CMD line from the SD card. The compute module ties the emmc's CMD to Vdd while it's disabled. See https://www.raspberrypi.org/documentation/hardware/computemodule/RPI-CM-V1_1-SCHEMATIC.pdf Thank you! Yes this w...
by datajerk
Fri Oct 07, 2016 12:25 pm
Forum: General discussion
Topic: STICKY: USB boot now working on Pi3
Replies: 544
Views: 356875

Re: USB boot now working on Pi3

Dougie - the link in datajerk's post contradicts what you say. There is a method to toggle boot modes by way of GPIO pulls, eg you can have it ignore an inserted SD card & boot from USB. Before setting the relevant OTP bit to enable this you'd better have some ~5k resistors at hand to pull up t...
by datajerk
Fri Oct 07, 2016 1:27 am
Forum: General discussion
Topic: STICKY: USB boot now working on Pi3
Replies: 544
Views: 356875

Re: USB boot now working on Pi3

So you can control which boot devices to check via GPIOs, or only enable certain modes in the OTP in the first place. I don't know whether just having USB mass storage enabled is faster than, but at least it would avoid some of the timeouts. Now this, i like, good old jumper days... Can anybody tel...
by datajerk
Wed Jun 01, 2016 10:57 am
Forum: General discussion
Topic: Pi3 incorrect results under load (possibly heat related)
Replies: 105
Views: 65518

Re: Pi3 incorrect results under load (possibly heat related)

I know I'm late to the party, but I just discovered this problem myself today with xhpl and openblas. Googling led me here. over_voltage=4 Works for me, but 2 did not (either locked up, or FAILED to validate solution). My results below. My rpi3 is not in a case, has a cheap heatsink about the size o...
by datajerk
Tue Sep 16, 2014 6:54 pm
Forum: Gaming
Topic: STICKY: MAME4ALL for Pi
Replies: 436
Views: 327968

Re: MAME4ALL for Pi

The resolution parameter is by default set to "auto". If you wanted to change this you would need something like "resolution=288x224". I've never tried this so I don't know what will happen. I run mame4all-pi at 1080p, so pixel variations (from up-scaling) are not really noticea...
by datajerk
Tue Sep 16, 2014 3:57 pm
Forum: Gaming
Topic: STICKY: MAME4ALL for Pi
Replies: 436
Views: 327968

Re: MAME4ALL for Pi

Is there a completely list of mame.cfg options for mame4all. I've been unable to find. I'll be checking the source soon. Specifically I'd like to nail down the stretch. E.g. I do not want 288x224 games stretched to 640x480. Thanks.

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