Apache NuttX RTOS on Star64 JH7110 RISC-V SBC is almost ready! But we're stuck with 16550 UART Controller firing too many Spurious Interrupts.

In this article, we explain…
(1) Why there’s No Console Output from NuttX Apps
(2) How Serial I/O works in NuttX QEMU
(3) How UART I/O differs for Star64 vs QEMU
(4) What’s the RISC-V Platform-Level Interrupt Controller (PLIC)
(5) Why we delegate RISC-V Machine-Mode Interrupts to Supervisor-Mode
(6) How NuttX Star64 handles UART Interrupts
(7) Which leads to a new problem: 16550 UART Controller fires too many Spurious Interrupts!


Star64 JH7110 + NuttX RTOS: RISC-V PLIC Interrupts and Serial I/O

   

Hello,

I haven't read anything new about the Pinebook Pro with ISO/UK Layout in the last weeks and the store page still just says "out of stock". Is there planned that the PBP will be available again? Is there a list to preorder for a batch eventually or something like that? Or is the PBP shifting out already and will be replaced by a newer device?

So I unfortunately was one of the people who broke one of the SIM card slot connectors so lte and such doesn’t work or is super spotty at best, anyway I purchased the 3gb ram 32 gb storage for the pine phone but I’ve never seen spare parts become available at this point I’d just buy the PPP if I wanted to use a daily Linux driver. Thank you for any help.

I want my app to make use of custom made symbolic icons for notifications using libnotify; where should I put my icons? are svgs okay? wb a particular naming scheme?
Any help's appreciated!

Hello.

I would like to know what is the maximum amperage of the 4-pin JST-XH connector since I am planning on powering 4 HDDs by means of it as well as whether it is possible to set up a staggered spinup configuration with the LSI SAS 9211-4i host bus adapter.

If the 4-pin JST-XH connector output current allows it, the project would entail splicing together two Pine64 power splitters somewhere between the cable input connector and the (seeming) buck converters.

Any advice on a suitable 230V 50Hz AC/DC PSU would also be appreciated.

Thank you.

Odd PPP boot issue (Explorer Edition, 2022.01.27 - I had to install tow-boot on this one).  

I can pwr+vol.dn to SD when flashed with the tow-boot or mobian installer, but these fail to boot:

Mobian (via installer from SD->SD) (tried twice)
Manjaro (`dd if=manjaro.img of=/dev/mmcblk1` from Mobian on eMMC) (+ read/hash check)

From eMMC, both OS's work fine.  And, I've successfully installed both on SD with PP (OG).  I suspect there's something wrong in the boot sequence.  How might I debug this?

Is it possible to buy Pine64 hardware offline? Like, you go to a physical store, pay in cash, take your order, and that's it. Nobody cares what's your name and address. No delivery, KYC, etc. Shipping company, for example, can mess with the package or damage it.

Is *at least one* of the folowing options possible? It'd be great in the EU store. If not, are there any plans for that?

1. Anonymous orders (in person, or by email, etc.).
2. Cash payments.
3. Personal pickup of orders in the store.

Hello, I recently bought 2 new official pinecile's v2 bl706. One works great, the other a gift simply shows a picture of a nail with with an X thru it, does this via usb-c pd or barrel (both of which work on other unit). Google didnt have anything bout that picture (hard to search for that tho) and I couldn't see anything in forums here about a nail with X. Clearly talking about the tip. Removed it cleaned it, made sure no debri on inside connections. Same thing. Is that a vague generic error picture or hopefully something fairly specific? Any webpage with the error icons explained? DOA seems crazy to me so I'm hopefull its something silly, cannot afford to buy another one. Never did look if a warranty of any kind exists. Thank you in advance.

Hello,
I recently received a Pinetab2, and I'm very pleased with the quality of manufacture. However, I wanted to try using Ubuntu touch or Mobian instead of Danctnix. I flashed the Ubuntu touch image listed on the releases page onto an SD card, plugged the SD card into the tablet, and turned it on. Every time I tried booting, it booted Danctnix. When I plugged the UART adaptor into the bottom USB C port and turned the switch to the "on" position, nothing at all booted. The same thing happened when I tried booting Mobian. 

I tethered the tablet to a phone and updated the Danctnix system, because I saw that on the most recent factory image, Mobian could supposedly boot without using the UART adapter. Nothing changed. 

I followed the instructions on this page to install Mobian. I installed U-boot, but I didn't see any change in behavior. According to the "About this System" page, the the version of U-Boot is 2023.07.02-00055-gc294612d38 and the kernel version is 6.4.3-danctnix1-1-pinetab2.

Does anyone have any suggestions?

Apache NuttX RTOS crashes on Star64 JH7110 RISC-V SBC because there's no Semihosting. But no worries! We modified NuttX to boot with an Initial RAM Disk instead (initrd).

In this article, we find out…
(1) What’s RISC-V Semihosting
(2) Why it crashes NuttX on Star64
(3) How it affects the Apps Filesystem in NuttX
(4) How we replaced Semihosting by Initial RAM Disk “initrd”
(5) After testing on QEMU Emulator
(6) Thanks to NuttX on LiteX Arty-A7 for the guidance!


Star64 JH7110 + NuttX RTOS: RISC-V Semihosting and Initial RAM Disk