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  1. hns

    Pyra datasheets

    Great work! Some comments for completion (if you want to make a Wiki Page) when comparing to the mass production release: * TCA6424ARGJ has been replaced by pin compatible NXP PCAL6524HEAZ * RF-connectors are U.FL type Molex 73412-0110 and Murata MM8430-2610RB3 * Speakers are Seltech...
  2. hns

    Slugs Be Gone!

    It was planned to use it but it never went to mass production... So we never did see a sample chip. The main difference would have been that it could have used lower power DRAM. But it would just have been the same processor chip in a different (smaller) package. So heat production would not...
  3. hns

    Slugs Be Gone!

    It can have a third value -10C... The reason is that the bq24297 can only report good, hot, cold and no values in between. It is a limitation of the chip design which we have tried to convert to reasonable values... 1616995469 And this within-the-battery sensor is reported by the bq24297 while...
  4. hns

    How Many Of Us Have A Dingoo And Run Dingux?

    Hi, I know that it is almost 12 years after the last discussion on this thread, but... ... the Skytone Alpha 400 (and other models like Letux 400) share (almost) the same processor (JZ4730 SoC) as the Dingoo A320. And we have made a big progress to run the latest Linux kernels (5.12-rc4) on...
  5. hns

    Torvalds Warns the World: Don't Use the Linux 5.12-rc1 Kernel

    You wouldn't have noticed either. The bug is only about configuring a swapfile which is usually not used on SD cards (too much wear) and only needed if you are doing RAM intensive work when the internal RAM (512 MB / 4 GB) is not enough. And we already have -rc2 for Pyra and Pandora...
  6. hns

    The Future of Pyra's CPU

    If there were an USB3 hub in the lower part and all interfaces like SD card readers, audio connections, modem, keyboard, external USB ports, all these need specific USB converters connected to the USB hub. With the current design all these are directly connected to the interfaces of the OMAP5...
  7. hns

    The Future of Pyra's CPU

    (I have added back some quotations of the original proposal and a response which goes in the direction of our design decisions). Well, we had thought about putting everything behind the display like a compact module. But such a design has quite some drawbacks. It is not only about data rate. For...
  8. hns

    On the upgradability of the Pyra

    Too big... And mainly too thick. And every standard is a set of compromises. A Pyra needs different ones.
  9. hns

    The Future of Pyra's CPU

    Imagination does not provide chips, they provide chip (GPU) designs to others who make chips. And those provide some SoC-support-package with some glued together kernel driver, sometimes with source code. The issue is that we as the open source community therefore have no access to documentation...
  10. hns

    Pyra mobile broadband performance

    Well, the cited article is indeed misleading. The PLS8 module is NOT a stripped down IOT modem neglecting features needed for portable devices but a full mobile device. It also contains everything for power-management on the modem side. It reduces power conumption while waiting for something to...
  11. hns

    Letux-OS

    postmarketOS is a good idea! Yes, touchscreen needs calibration. The nubs are available as /dev/input/event but only as nubs after you do this echo mouse > /proc/pandora/nub0/mode # mouse echo mbuttons > /proc/pandora/nub1/mode # mouse buttons This seems to...
  12. hns

    Just a quick heads up

    Stops charging because the charger chip resets itself after ca. 40 seconds into power-on-state which limits charging+operation current to 500mA. There seems to be a subtle difference between the LetuxOS U-Boot and the PyraOS U-Boot which explains why I never had seen this same issue with charging.
  13. hns

    Just a quick heads up

    Well, two years ago I talked to a retired metereologist who had started in the 70ies and had to participate in airline flights to find out about cloud distributions, wind directions etc. and his job was to predict that for airline route planning. He simply said: you get what you pay for. All the...
  14. hns

    Just a quick heads up

    It may be counter-intuitive but some physical systems (climate is a physical system) are easier to understand and predict entirely if you ignore the little details. This is why scientists can predict (and analyse) climate change even if it is not possible to have a precise and local weather...
  15. hns

    Just a quick heads up

    We can continue to run online business. Only the majority of physical stores, schools etc. are closed to keep people away from each other and give the virus no chance to spread. Restaurants, sports and event locations are already closed for a while. And there are restrictions for personal...
  16. hns

    Are you interested in a new Pandora LCD cable?

    Yes it is a https://en.wikipedia.org/wiki/Binder_clip and a very strong one...
  17. hns

    Are you interested in a new Pandora LCD cable?

    Well, such a microswitch is already inside the windshield wiper motor (originally used to move it to the stow-away position) and it simply triggers the mechanical counter. It should be possible to feed that signal (with proper voltage divider and overvoltage protection) to the device controlling...
  18. hns

    Are you interested in a new Pandora LCD cable?

    Once again almost 2 months later: So the machine is finished and I have to think about safe transportation to ED since he will be running the tests. What has not yet been completely elaborated is how to precisely detect that the LCD cable did break and after how many movements. Well, the...
  19. hns

    Serial console access for boot debugging and other tricks

    During development of the LetuxOS kernel to support the Pandora it was very helpful to have access to the serial console through the expansion connector of the Pandora. Since the initial version was a little fragile, I have designed a tiny adapter a while ago that does not block the Pandora...
  20. hns

    Just a quick heads up

    Thanks for locating this! Yes, it is exactly this issue: "3.13 McPDM Downlink Data Corrupted With TWL604x". Was already present with omap4 and not only omap5. It is clock noise that disturbs and corrupts the PCM data stream and that is converted into audible noise by the digital analog...
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