linux-kernel - RE: Memory and IO space Enabling different in x86 and ARM64

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Message-ID: <8520D5D51A55D047800579B094147198258B98B2@XAP-PVEXMBX01.xlnx.xilinx.com>
Date:	Sat, 16 Jul 2016 03:22:30 +0000
From:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	nofooter <nofooter@...inx.com>,
	"Liviu.Dudau@....com" <Liviu.Dudau@....com>
Subject: RE: Memory and IO space Enabling different in x86 and ARM64

> Subject: Re: Memory and IO space Enabling different in x86 and ARM64
>
> On Friday, July 15, 2016 8:29:49 AM CEST Bharat Kumar Gogada wrote:
> > I observe that memory and IO space are enabled by BIOS in x86.
> >
> > In ARM64 we need to call pci_enable_device form End Point to enable
> these resources.
> >
> > Why the resource enablement is different in x86 and ARM64 ?
> >
> > Please correct me if my observation is wrong.
>
> This is a difference between systems with a BIOS and embedded systems
> with a plain bootloader that ignores PCI. On an ARM64 server system with
> UEFI you should expect the device to be usable too, but on an embedded
> system, Linux takes the role of the BIOS.
>
Thanks Arnd Bergmann



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