From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
nofooter <nofooter@xilinx.com>,
"Liviu.Dudau@arm.com" <Liviu.Dudau@arm.com>
Subject: Re: Memory and IO space Enabling different in x86 and ARM64
Date: Fri, 15 Jul 2016 10:33:06 +0200 [thread overview]
Message-ID: <7127812.WYSppNUyGc@wuerfel> (raw)
In-Reply-To: <8520D5D51A55D047800579B094147198258B9376@XAP-PVEXMBX01.xlnx.xilinx.com>
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.
Arnd
next prev parent reply other threads:[~2016-07-15 8:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-15 8:29 Memory and IO space Enabling different in x86 and ARM64 Bharat Kumar Gogada
2016-07-15 8:33 ` Arnd Bergmann [this message]
2016-07-16 3:22 ` Bharat Kumar Gogada
2016-07-15 21:47 ` Bjorn Helgaas
2016-07-16 3:25 ` Bharat Kumar Gogada
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