> -----Original Message----- > From: One Thousand Gnomes [mailto:gnomes@xxxxxxxxxxxxxxxxxxx] > Sent: 09 November 2016 13:55 > To: Arnd Bergmann > Cc: Mark Rutland; Yuanzhichang; catalin.marinas@xxxxxxx; > will.deacon@xxxxxxx; robh+dt@xxxxxxxxxx; bhelgaas@xxxxxxxxxx; > olof@xxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; > lorenzo.pieralisi@xxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Linuxarm; > devicetree@xxxxxxxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx; linux- > serial@xxxxxxxxxxxxxxx; minyard@xxxxxxx; benh@xxxxxxxxxxxxxxxxxxx; > liviu.dudau@xxxxxxx; zourongrong@xxxxxxxxx; John Garry; Gabriele > Paoloni; zhichang.yuan02@xxxxxxxxx; kantyzc@xxxxxxx; xuwei (O); > marc.zyngier@xxxxxxx > Subject: Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for > special ISA > > > I think it is a relatively safe assumption that there is only one > > ISA bridge. A lot of old drivers hardcode PIO or memory addresses > > It's not a safe assumption for x86 at least. There are a few systems > with > multiple ISA busses particularly older laptops with a docking station. Mmmm right...now the point is that this kind of special devices appearing as a special ISA bus will probably never appear on x86 platforms (I guess). So maybe it is a safe assumption because of this...? Thanks Gab > > > when talking to an ISA device, so having multiple instances is > > already problematic. > > PCMCIA devices handle it themselves so are ok. I'm not clear how the > dual > PIIX4 configuration used in the older IBM laptop docks actually worked > so > I assume the transaction went out of both bridges and providing one of > them responded the other kept silent as you simply stuffed the card > into > the dock and it worked. > > Alan -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
