Re: [Raspberry] some issues

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  Hi,

> Not off hand, sadly we seem to be having the early adopters problem on
> a 4.5 year old device :-/

Indeed ...

> It's a pity all the EDID and similarly related monitor detection stuff
> wasn't shared across drivers in a central location. Going from a
> closed driver with a forked kernel we've never supported to a fully
> open upstream doesn't give us a lot of room. I'm not a graphics
> developer, nor really a kernel developers, so we're at a combination
> mercy of upstream and not even the ability to dig into the
> driver/firmware to workout what the other driver does.

When the firmware loads the kernel directly the downstream way (without
uboot) it adds a bunch of parameters to the kernel command line:

   dma.dmachans=0x7f35
   bcm2708_fb.fbwidth=1776        <- look
   bcm2708_fb.fbheight=952        <- here
   bcm2709.boardrev=0xa01041
   bcm2709.serial=<censored>
   smsc95xx.macaddr=<likewise>
   bcm2708_fb.fbswap=1
   bcm2709.uart_clock=48000000
   bcm2709.disk_led_gpio=47
   bcm2709.disk_led_active_low=0
   vc_mem.mem_base=0x3dc00000     <- and
   vc_mem.mem_size=0x3f000000     <- here
   [ cmdline.txt content follows ]

So, the downstream firmware -> kernel parameter passing actually pretty
simple.  I think at least parts of this are also passed via device tree
these days.

Given that downstream plans to switch to the vc4 driver I expected to
find some way to configure overscan with vc4 too (even if it doesn't
pick up the settings from config.txt).  But so far I havn't found
anything.  Sad to see you have no idea too.

cheers,
  Gerd

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