Re: Microblaze libgloss and gdb simulator

On 23 Apr 2021 07:48, Joel Sherrill wrote:
> On Fri, Apr 23, 2021 at 1:17 AM R. Diez <[email protected]> wrote:
> > > [...]
> > > Does anyone know how to build and run a hello world on the microblaze
> > > simulator in gdb using the microblaze-elf target and the code in
> > libgloss?
> >
> > Does it have to be the GDB simulator? QEMU seems to support the MicroBlaze
> > too.
> >
> > I am using QEMU to simulate a Cortex-M3 board, and writing to a particular
> > memory address where a UART is supposed to be outputs the byte on the host
> > console.
> >
> 
> No it doesn't. We use Qemu on at least arm, aarch64, x86, and sparc. Even
> though they tend to be just CPU simulators, the gdb simulators just tend to
> be
> easier to work with and can run a high percentage of RTEMS tests. When first
> starting a port, you are focused primarily on startup and context switches,
> and
> the gdb simulators work great for that. The devices are so simple, that the
> BSP
> is trivial.
> 
> For interrupt and real device support, you do have to move to something
> like qemu or real hardware. We likely will just have to move to it.

GNU sim can do these too ;), but i can see it being easier when most people
are contributing to QEMU already to make it just work.

newlib/libgloss missing bsp code wouldn't be addressed by sim selection
though :).
-mike