Difference between revisions of "PineNote"
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This section includes discussions and their results regarding hardware changes to the PineNote. | This section includes discussions and their results regarding hardware changes to the PineNote. | ||
The following topics have resolved: | |||
* [[PineNote/Hardware_Changes/Closed_Case_UART]] | * [[PineNote/Hardware_Changes/Closed_Case_UART]] | ||
* '''Could the USB-C port support USB 3.1 5Gbps?''' Yes and no. The RK3566 only has a host-mode 5Gbps controller, meaning it can only negotiate such a high data rate with a device such as a flash drive. When the RK3566 is acting as a device, it only supports 480Mbps transfer rates. The hardware required to switch between these modes would raise the PineNote's price unreasonably. Therefore, the USB-C port will remain at USB 2.0 speeds for Host and Device mode. | |||
* '''Could the USB-C port output DisplayPort?''' Yes and no. The hardware required to support such a feature would raise the PineNote's price unreasonably. Therefore, DisplayPort output will not be possible through the USB-C port. | |||
* '''Where is the microSD card slot?''' The case design of the PineNote is fixed, making physical changes like adding a microSD card slot would raise the cost unreasonably. However, revisions of the PineNote motherboard after 1.1 will feature an internal ribbon cable connector where a microSD card slot may be attached. Attaching such a device will require taking the PineNote apart. | |||
* '''How will I install software to the PineNote?''' This is a hardware and software question. If the software on your PineNote is completely broken and cannot boot to a recoverable state, a Hall (magnet) sensor was fitted to the PineTab motherboard as U9009. This sensor is attached to SARADC_VIN0_KEY/RECOVERY on the RK3566. With the device powered off, holding a magnet over U9009 and plugging in a USB-C cable causes the device to boot into [http://opensource.rock-chips.com/wiki_Rockusb|"rockusb"] flash mode. With proper flashing software and drivers, it should be possible to load a new operating system using rockusb if the system is soft-bricked. Of course, software vendors will need to be more careful with flashing firmware and providing useful "recovery" options on this device due to this process's relative difficulty to other PINE64 devices. | |||
The following concerns have been brought up as open, unanswered topics: | |||
* Does [https://en.wikipedia.org/wiki/USB-C#Audio_Adapter_Accessory_Mode_2|USB-C Audio Adapter Accessory Mode] work? It appears that the Headphone output of the audio codec was routed to the USB-C audio+USB switch, but it's unclear whether CC lines are hooked up correctly for detection of such a device. The PineNote hardware team will be testing this functionality soon (as of August 19, 2021). | |||
* Why is the Headphone output of the audio codec routed to the speakers? HPL_OUT is routed from the RK817 PMIC and audio codec to U9010 (the USB-C switch) and U6 (the audio amplifier). SPK_OUT is unused. It seems like SPK_OUT should be routed to U6 and HPL_OUT to U9010. | |||
* Nitpick: The cold white charging LED bleeds through the gap between the rear case and the device's face. It does not bleed onto the screen, but it is jarring in low-light conditions or when the screen is amber. Could be resolved in software by turning off the charge LED when the screen is on. | |||
* Is there any way to indicate when the device is in rockusb mode, such as connecting a certain magic pin to the power LED? | |||
== BSP Linux SDK == | == BSP Linux SDK == |