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by jdb
Sat Mar 01, 2014 1:32 pm
Forum: Troubleshooting
Topic: External disk often been corrupted
Replies: 5
Views: 1151

Re: External disk often been corrupted

It looks like you've rolled your own kernel and the BUG() was in f2fs.

What filesystem is on the external drive?
by jdb
Sat Mar 01, 2014 10:52 am
Forum: Troubleshooting
Topic: Exploding Pi
Replies: 28
Views: 6783

Re: Exploding Pi

If that's a genuine Samsung charger then I'll eat my hat.
by jdb
Sat Mar 01, 2014 10:12 am
Forum: Troubleshooting
Topic: Exploding Pi
Replies: 28
Views: 6783

Re: Exploding Pi

That is a high-energy flash. The only possible source is the mains-level voltage supply to the charger. This means that the high-voltage insulation between the primary and secondary side of the transformer has failed somehow: either through the primary side exploding and contaminating the board such...
by jdb
Sat Mar 01, 2014 10:00 am
Forum: Troubleshooting
Topic: Call for beta testers: FIQ_FSM USB driver rewrite
Replies: 250
Views: 119418

Re: Call for beta testers: FIQ_FSM USB driver rewrite

Thanks for the testing. The FSM FIQ should have a negligible impact on USB2.0 transfers - its job is to be transparent to high-speed bulk or interrupt traffic - but the larger code size of the FIQ handler may incur a slight overhead. Code paths through the FSM FIQ are not yet completely optimised: t...
by jdb
Thu Feb 27, 2014 8:31 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Troubles with PWM and Audio
Replies: 2
Views: 808

Re: Troubles with PWM and Audio

There is a single 2-channel PWM peripheral on the Pi which can be routed out to either the 3.5mm jack or a single channel can be routed to the GPIO pins. Using it to output via the GPIO pins means that you trample on the settings for audio. For a display, you do not need to have a particularly high ...
by jdb
Thu Feb 27, 2014 12:54 pm
Forum: Advanced users
Topic: Software control of WIFI power
Replies: 2
Views: 927

Re: Software control of WIFI power

All USB devices are in theory required to support a Suspend state - this is a low-power bus state that requires downstream devices consume no more than 0.5mA of power. Problem is that some devices go screwy if you suspend them. You'd have to test your device to see if it recovers correctly after sus...
by jdb
Wed Feb 26, 2014 12:06 pm
Forum: General discussion
Topic: Usb gamepad on pcsx emulator
Replies: 1
Views: 378

Re: Usb gamepad on pcsx emulator

Can you post the full output of lsusb -v and dmesg?

Certain game controllers are recognised as generic HID devices, which Linux assumes will be something like a keyboard or mouse. Specific drivers are sometimes required for these devices.
by jdb
Wed Feb 26, 2014 11:54 am
Forum: General discussion
Topic: The process of Cross-compiling Pi kernel
Replies: 2
Views: 578

Re: The process of Cross-compiling Pi kernel

6) You can, but beware that if it's from a very old Pi with an older version of the kernel it may not be compatible. You should use one from a similar branch (e.g. 3.6 or 3.10).
7) You should unzip the config.gz. Or just zcat /proc/config.gz > .config
9) Yes.
by jdb
Wed Feb 26, 2014 10:19 am
Forum: Troubleshooting
Topic: USB redux
Replies: 514
Views: 217149

Re: USB redux

It's only on BRANCH=next as it's still under testing.
by jdb
Tue Feb 25, 2014 8:03 pm
Forum: Troubleshooting
Topic: USB redux
Replies: 514
Views: 217149

Re: USB redux

By given up I was referring to comments made in QCN forums by people trying to make the QCN sensors work with the Pi. It would indeed be interesting to know if they would have more success with the latest fixes, that is why I was suggesting that the Foundation should make contact with the folks at ...
by jdb
Mon Feb 24, 2014 6:50 pm
Forum: Troubleshooting
Topic: Call for beta testers: FIQ_FSM USB driver rewrite
Replies: 250
Views: 119418

Call for beta testers: FIQ_FSM USB driver rewrite

The latest rpi-update kernels now include fiq_fsm, my USB driver rewrite. This is a comprehensive rewrite to push more of the time-critical work into the FIQ in order to get needed reliable communication to problem USB devices. Last post update: 28/04/2014 1. Installation The rpi-update kernel has f...
by jdb
Mon Feb 24, 2014 12:30 pm
Forum: Troubleshooting
Topic: USB redux
Replies: 514
Views: 217149

Re: USB redux

Thanks for the testing.

If you compare results with the two cmdline.txt settings dwc_otg.fiq_fsm_mask=0x3 and dwc_otg.fiq_fsm_mask=0x1, do things start working?
by jdb
Tue Feb 18, 2014 2:29 pm
Forum: Troubleshooting
Topic: KGDB session on RPi
Replies: 2
Views: 1638

Re: KGDB session on RPi

KDB is a keyboard frontend of kgdb. You have to explicitly enter pass-through mode if you're in kdb.

https://www.kernel.org/pub/linux/kernel ... bKgdb.html
by jdb
Mon Feb 17, 2014 10:26 am
Forum: General discussion
Topic: Maximum USB devices
Replies: 2
Views: 931

Re: Maximum USB devices

You can plug as many devices as you like into a Pi subject to the general USB specification limitations: - You can only cascade hubs 5-deep (including the hub inside the LAN9512 chip) - There are a maximum of 127 bus addresses - You need to have enough power to provide 5V within specification to all...
by jdb
Fri Feb 14, 2014 3:25 pm
Forum: Troubleshooting
Topic: I must replug usb device to be visible
Replies: 9
Views: 3029

Re: I must replug usb device to be visible

Your hub is probably still powering the device with the Pi unplugged.

In this state, the hub will "suspend" all its ports. This is a low-power USB state that devices should all support, but many don't. Some can only be recovered from suspend by cycling the power.
by jdb
Wed Feb 12, 2014 10:59 pm
Forum: General discussion
Topic: RaspBerry Pi(e) Model C (imaginations & wants)
Replies: 431
Views: 158167

Re: RaspBerry Pi(e) Model C (imaginations & wants)

WOL wouldn't be that hard to implement on a Pi.

You just have to be in possession of a decent microscope, 0.2mm diameter wire and very steady hands.

Then you can solder a wire to a nominated LAN9512 GPIO through a reset "pulse" circuit that blips the RUN# pin on a Pi.
by jdb
Tue Feb 11, 2014 9:43 pm
Forum: Advanced users
Topic: Understanding github tweets by @RPF_Dev_Updates
Replies: 4
Views: 1118

Re: Understanding github tweets by @RPF_Dev_Updates

This happens when upstream changes are pulled into our repository.

Basically all the patches that go into Linux-3.10 (stable) branch get committed to our repository: for some reason this causes a lot of spam in the twitter feed.
by jdb
Tue Feb 11, 2014 8:30 pm
Forum: General discussion
Topic: Battery power?
Replies: 1
Views: 365

Re: Battery power?

The portable battery "booster packs" for phones tend to have quite well-regulated converters inside.

The problem would be having to change the batteries every few hours...
by jdb
Tue Feb 11, 2014 8:25 pm
Forum: Troubleshooting
Topic: USB audio crackle with SD card access
Replies: 3
Views: 1254

Re: USB audio crackle with SD card access

This is a known problem. The manifestation is the same but for two different root causes: the first case is where the USB driver doesn't send packets out at the right time (early enough in a USB frame, or with sufficient precision to ensure that contiguous data is received by the hub) - this is caus...
by jdb
Tue Feb 11, 2014 2:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: as i2c slave
Replies: 3
Views: 788

Re: as i2c slave

There is an I2C slave peripheral in BCM2835, unfortunately the pinout of the GPIOs is such that you can't access its SCL/SDA pins.

The peripheral itself is also not a bog standard I2C slave - it has a mode that was intended to allow booting of the GPU.
by jdb
Sat Feb 08, 2014 10:56 am
Forum: General discussion
Topic: RaspBerry Pi(e) Model C (imaginations & wants)
Replies: 431
Views: 158167

Re: RaspBerry Pi(e) Model C (imaginations & wants)

We are still investigating the SD card problem. Most people should be generally OK now but there do still seem to be some edge cases. Note that SD cards themselves contain firmware for the little MCU that does the flash translation, wear leveling, ECC, bad block eviction and other housekeeping func...
by jdb
Sat Feb 08, 2014 12:16 am
Forum: General discussion
Topic: Pi version 2 - name ideas!
Replies: 28
Views: 5327

Re: Pi version 2 - name ideas!

Raspberry Tau. While the first took the greek letter for the ratio between the radius of a circle and its circumference, the second is named for the time constant that it takes for engineers to agree on what to call the Raspberry Tau. Version 2 names? Then there is fictional names like Snozberry. Hm...
by jdb
Fri Feb 07, 2014 10:47 pm
Forum: General discussion
Topic: RaspBerry Pi(e) Model C (imaginations & wants)
Replies: 431
Views: 158167

Re: RaspBerry Pi(e) Model C (imaginations & wants)

What would really be nice for the model c is if it had a Atom processor or some other form of x86 processor, then you wouldnt be confined to use only Linux, you could also use Windows too(Because why would anybody want to run (Cr)Apple's c**p OS?). You do realise that there are more devices running...
by jdb
Fri Feb 07, 2014 6:35 pm
Forum: Advanced users
Topic: Using RPi as Nas
Replies: 7
Views: 14329

Re: Using RPi as Nas

This is my setup: 2x Cheapo 3.5" USB2.0 caddies (external power supplies for both) - 3.0TB 5400RPM drives in each Caddies directly connected to Pi, no hub Ethernet wired connection Both hard drives are combined using md "linear" or JBOD personality to create a contiguous drive. EXT4 filesystem sits ...

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