Messages in this thread | | | Subject | Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays | From | Pantelis Antoniou <> | Date | Thu, 7 Nov 2013 09:27:06 +0200 |
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Hi Guenter,
On Nov 6, 2013, at 11:17 PM, Guenter Roeck wrote:
> On Wed, Nov 06, 2013 at 09:38:21PM +0100, Sebastian Andrzej Siewior wrote: >> On 06.11.13, Guenter Roeck wrote: >>> At least that is our use case. u-boot doesn't know which cards are going to be >>> inserted at runtime. Even PCIe hotplug itself is insufficient, as the PCIe >>> configuration differs per card, and the cards support a variety of i2c devices >>> as well as other card specific devices such LEDs and multi-function FPGAs. >> >> So you have your FPGA behind PCIe and you use the DT to describe the >> chips behind i2c? And then you update your FPGA and want update the >> devices in DT without reboot? >> > No. > > We have a variety of boards ... [snip]
TL;DR the real world...
> > We use DT overlays to describe the hardware on those boards and, if necessary, > its configuration. For example, if there is a PCIe switch, the overlay would > describe its memory and bus number configuration. > > Guenter
Glad it's been useful...
Regards
-- Pantelis
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