On 14/02/2020 16:29, Joel Sherrill wrote:
On Fri, Feb 14, 2020 at 9:16 AM Sebastian Huber
<sebastian.hu...@embedded-brains.de
<mailto:sebastian.hu...@embedded-brains.de>> wrote:
On 14/02/2020 15:45, Joel Sherrill wrote:
On Fri, Feb 14, 2020 at 7:08 AM Sebastian Huber
<sebastian.hu...@embedded-brains.de
<mailto:sebastian.hu...@embedded-brains.de>> wrote:
On 14/02/2020 13:57, Joel Sherrill wrote:
> Hi
>
> I haven't investigated or checked on other bsps but the
xilinx qemu
> bsp has no output with the hello world in examples. It uses
the devfs.
> Changing it to the default filesystem results in it working.
>
> I am suspicious of something with all the termios and new
console
> changes breaking it.
The devfs works only with legacy IO drivers. The Termios
drivers depend
on IMFS. I would like to remove the devfs in the future. The
IMFS is
highly configurable, there is no need for an additional
in-memory file
system.
Do not remove it. Please fix it.
The IMFS should be improved, so that we can remove the devfs. We
already have a bunch of configuration options to customize it:
https://docs.rtems.org/branches/master/c-user/configuring_a_system.html#file-system-configuration-parameters
You should look at the requirements for the older ESA RTEMS versions.
They
had very specific requirements which ended up with the filesystem code
largerly removed AFAIK.
You can get rid of the file system with the
CONFIGURE_APPLICATION_DISABLE_FILESYSTEM configuration option.
And you did break existing code in the public repository. If we need
more tests
to ensure it works, then so be it. It is a feature in the current code
base and it
just broke.
Until the IMFS can be proved to be configurable to meet the
requirements that
resulted in the filesystem code being removed/minimized in the old
ESA versions
and other folks who needed the simplest possible infrastructure for
devices so
our normal frameworks would work, it needs to stay and work.
If you want a minimal setup, then why do you want to use the POSIX
open/read/write API to access devices? The POSIX functions pull in errno
for example which pulls in the re-entrancy support which pulls in a hell
of dependencies. Why do you want to use a console driver with Termios in
a minimal setup?
You can have a goal which you may or may nor achieve but you can't
leave a
trail of code that is broken just because you don't like it.
To fix this break, I suggest to map CONFIGURE_FILESYSTEM_DEVFS to a
suitable IMFS configuration similar to
CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM.
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