linux-kernel - Why does BIOS assign memory to 16 byte BAR

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Message-ID: <8520D5D51A55D047800579B094147198258BB59B@XAP-PVEXMBX01.xlnx.xilinx.com>
Date:	Fri, 22 Jul 2016 09:24:22 +0000
From:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
	nofooter <nofooter@...inx.com>, nofooter2 <nofooter2@...inx.com>
Subject: Why does BIOS assign memory to 16 byte BAR

Hi,

I'm observing that on x86 BIOS successfully assigns memory if an End point requests
BAR of size 16byte.

But as per Spec:
The minimum memory address range requested by a BAR is 128 bytes.

Why BIOS is successfully allocating region to 16 byte BAR requests?

Please let me know if my observation is wrong.

Regards,
Bharat

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