RTEMS on QEMU emulated RPi and RPi2

[Deval Shah]

Hello Pavel,

I would like to work on this problem. Can I get some more details and some
literature to go through ?

Thanks,
Deval Shah

On Fri, May 27, 2016 at 1:59 AM, Pavel Pisa <ppisa4lists at pikron.com> wrote:

> Hello all,
>
> it seems that Raspberry Pi QEMU emulation cannot work
> with current RTEMS BSP because it uses BCM2835_TIMER_
>
> as the main clock source, see
>
> rtems/c/src/lib/libbsp/arm/raspberrypi/clock/clockdrv.c
>
> which is mapped to
>
> #define RPI_PERIPHERAL_BASE      0x3F000000
> #define BCM2835_TIMER_BASE       (RPI_PERIPHERAL_BASE + 0xB400)
>
> but when I invoke "info mtree" in QEMU monitor console,
> it reports
>
> address-space: memory
>   0000000000000000-ffffffffffffffff (prio 0, RW): system
>     0000000000000000-000000003fffffff (prio 0, RW): ram
>     000000003f000000-000000003fffffff (prio 1, RW): bcm2835-peripherals
>       000000003f007000-000000003f007fff (prio 0, RW): bcm2835-dma
>       000000003f00b200-000000003f00b3ff (prio 0, RW): bcm2835-ic
>       000000003f00b800-000000003f00bbff (prio 0, RW): bcm2835-mbox
>       000000003f201000-000000003f201fff (prio 0, RW): pl011
>       000000003f215000-000000003f2150ff (prio 0, RW): bcm2835-aux
>       000000003f300000-000000003f3000ff (prio 0, RW): sdhci
>       000000003fe05000-000000003fe050ff (prio 0, RW): bcm2835-dma-chan15
>     0000000040000000-00000000400000ff (prio 0, RW): bcm2836-control
>
> which means that area 000000003f00b400-000000003f00b7ff is unmapped.
> Linux and Windows use local Cortex-A CPU timers most probably on RPi2,
> so actual RTEMS BSP is not compatible with QEMU RPi2 support.
>
> It is not so hared to extend RPi2 QEMU support but it requires
> time.
>
> Best wishes,
>
>                     Pavel
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