On 3/28/2024 9:21 PM, yfliu2008 wrote:
> I am still trying to understand existing userland address envrionment
in NuttX kernel mode, I saw the following regions defined in
"arch/Kconfig": config ARCH_TEXT_VBASE, config ARCH_DATA_VBASE, config
ARCH_HEAP_VBASE, config ARCH_SHM_VBASE, config AR
Gregory, thank you!I am still trying to understand existing userland address envrionment in NuttX kernel mode, I saw the following regions defined in "arch/Kconfig": config ARCH_TEXT_VBASEconfig ARCH_DATA_VBASEconfig ARCH_HEAP_VBASEconfig ARCH_SHM_VBASEconfig ARCH_KMAP_VBASEconfig ARCH_STACK_
On 3/28/2024 8:23 PM, Gregory Nutt wrote:
...
On all platforms that I am aware of, the virtual address of the
framebuffer is just a configurable constant. This makes sense if the
framebuffer is in a fixed virtual address in every process. The kernel
can manage the virtual address space any
On 3/28/2024 7:05 PM, yfliu2008 wrote:
Yes the user land only use standard file operations like
"mmap()/read()/write()/munmap()/ioctl()" etc to access the device memory and interruption
status via the exposed device files like "/dev/uio3" etc.
Sorry it took me so long to catch on.
My origi
This could actually be very interesting. mmap() really does all of the
work. But notice that mmap() it is not passed any address information
(other than a "suggested" mapped, user-space address). It also received
an instance of the file descriptor of the driver.
The Linux file_operations st
I found this document which describes the use cases for UIO in Linux:
https://www.kernel.org/doc/html/v4.13/driver-api/uio-howto.html . They
use mmap() to addess device memory: "|/dev/uioX| is used to access the
address space of the card. Just use |mmap()| to access registers or RAM
locations o
A more interesting task would be to port NxLib to run on top of the
existing NuttX NX Windows System:
* https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139629474
* https://cwiki.apache.org/confluence/display/NUTTX/NX+Graphics+Subsystem
That would not be particularly easier, h
On 3/28/2024 11:17 AM, Shijo George wrote:
I was planning to port NanoX to NuttX as part of GSoC. Is anyone familiar
with NanoX? Any suggestions and help would be much appreciated.
Regards ,
Shijo george
This will likely be a very difficult job. Nano-X is a complete X-11
replacement from the
I was planning to port NanoX to NuttX as part of GSoC. Is anyone familiar
with NanoX? Any suggestions and help would be much appreciated.
Regards ,
Shijo george
On 3/28/2024 1:03 AM, yfliu2008 wrote:
...
Have "up_addrenv_map(), up_addrenv_unmap()" alike interfaces added to
encapsulate MMU mapping operations of different chip architectures. These are used by UIO
component to a.
As an architectural description it is confusing to understand what you
se
On 3/28/2024 8:21 AM, Gregory Nutt wrote:
On 3/28/2024 1:03 AM, yfliu2008 wrote:
Have UIO framework added which exposes an "uio_register_device()"
interface to BSP so that to instantiate different UIO devices
with specific device path, address range and IRQ data.
Then userland apps can use st
On 3/28/2024 1:03 AM, yfliu2008 wrote:
Dear experts,
I am wondering if we can have an Userspace IO alike component added to NuttX
kernel? It can help exposing video frame buffers or neural network
accelerators alike devices to user land services. Often kernel has little to do
with such devic
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