François Beaufort wrote:
> Hello,
>
> I have to port Linux-xenomai on target Phytec PhyCARD-M iMx35 (ARM 11 core)
> and I need your help.
>
> I reconfigured the kernel from the configuration provided by Phytec :
>
> - CONFIG_PREEMPT = y
> - CONFIG_VGA_CONSOLE = n
> - CONFIG_MX3_IPU = n
> - CONFIG_FB_MX3 = n
> - CONFIG_USB_ISP1760 = n
>
> So, Linux-xenomai runs on the target, but I can't have pictures on the
> display (the configuration of the framebuffer is not set : CONFIG_MX3_IPU and
> CONFIG_FB_MX3).
>
> I would like to enable xenomai and the framebuffer.
>
> When I patch Linux with adeos-ipipe, disable xenomai and enable ipu (image
> processing unit), the kernel doesn't start :
>
> booting kernel of type uimage from /dev/ram0.kernel
> Verifying Checksum ... OK
> Image Name: Linux-2.6.35.9
> Created: 2011-04-20 7:14:44 UTC
> Image Type: ARM Linux Kernel Image (uncompressed)
> Data Size: 2446512 Bytes = 2.3 MB
> Load Address: 80008000
> Entry Point: 80008000
> OK
> commandline: console=ttymxc0,115200 video=mx3fb:Primeview-PD050VL1
> ip=192.168.0.195::192.168.0.1:255.255.255.0::: root=/dev/nfs
> nfsroot=192.168.0.84:/opt/francois/nfs_imx35_xenom;
> arch_number: 2595
>
> Starting kernel ...
>
> Linux version 2.6.35.9 (francois@francois-desktop) (gcc version 4.3.2
> (OSELAS.Toolchain-1.99.3) ) #2 PREEMPT Wed Apr 20 09:14:32 CEST 2011
> CPU: ARMv6-compatible processor [4117b363] revision 3 (ARMv6TEJ),
> cr=00c5387f
> CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction c
>
>
> I think there is a conflict between ipipe and ipu but I don't know why.
>
> IPU depends on dma engine.
>
> When I read the /proc files, I can't see IRQ conflicts nor memory conflicts.
>
> The ipu driver consists of two C files : ipu_idmac.c and ipu_irq.c.
> When I disable ipu_idma.c, I have 4 more IRQs (CONFIG_MX3_IPU_IRQS = 4) and
> Linux-ipipe (and xenomai) starts but I can't have pictures on the display.
>
> I can't debug with printk because the printk calls modify the behaviour.
How so?
>
> Do you have any idea ?
First thing to confirm: does the same configuration which does not work
with I-pipe enabled work with I-pipe disable. I mean, the exact same
configuration except for CONFIG_IPIPE?
Second thing: if the IPU dma engine, whatever, uses an interrupt, can
you compare the counters in /proc/interrupts for this interrupt with and
without CONFIG_IPIPE enabled?
--
Gilles.
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