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To: linux-pci@vger.kernel.org
From: Peio <peio@azkarate.eu>
Subject: Re: PCI rescan : can't assign mem [SOLVED]
Date: Thu, 3 Sep 2015 09:45:47 +0000 (UTC)
Message-ID: <loom.20150903T113710-656@post.gmane.org>
References: <loom.20150831T091131-859@post.gmane.org> <CAE9FiQWNA1BEGom757xtbc0zFjFqZ9uqKwj2kM7EFDDKXEL6fw@mail.gmail.com> <loom.20150901T110001-176@post.gmane.org> <CAE9FiQUxU2FCxFKQ=6ZdnJL8fU-YxAOjQmMSAP_YBG1gEG+ntA@mail.gmail.com> <loom.20150902T084450-322@post.gmane.org> <CAE9FiQWgrymUN07D5rFr0XVrF1Ays606JaWQCfH47Av0cv8q0g@mail.gmail.com> <loom.20150903T080202-734@post.gmane.org>
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Peio <peio <at> azkarate.eu> writes:

> 
> Yinghai Lu <yinghai <at> kernel.org> writes:
> 
> > boot with pci=nocrs ?
> > 
> > Try to get BIOS update.
> > 
> > > If I change BIOS parameters I'll need a fresh install or the actual 
kernel
> > > reconigzes changes?.
> > should not.
> > 
> 
> I'll try pci=nocrs and BIOS update.
> Thank you Yinghai.
> 
> 
I solved the issue.

1.- Boot kernel with pci=nocrs parameter (linux assigns lot of memory ro pci 
root bus).

2.- Remove upstream bridge : 
sudo echo 1 > /sys/bus/pci/devices/0000:00:1c.0/remove

3.- Rescan PCI bus
sudo echo 1 > /sys/bus/pci/rescan