From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Date: Mon, 25 May 2015 19:09:09 +0200 Subject: [U-Boot] U-boot qemu-x86 :load acpi tables from fw_cfg. In-Reply-To: References: Message-ID: <55635735.3060003@gnu.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 22/05/2015 18:54, Saket Sinha wrote: > Hi Simon, > >>> >>> Is it possible for us to add support to qemu to provide acpi tables >>> via fw_cfg in u-boot ? >>> >>> If we find acpi tables in fw_cfg try loading them, otherwise fallback >>> to the builtin acpi tables. >>> >>> Coreboot does it in the following way - >>> http://review.coreboot.org/#/c/4040/ >> >> It seems like it might be useful to implement this in U-Boot. Perhaps >> look at this after you have the built-in support running? >> > > I guess it would be extremely useful for u-boot. > > It is being used by q-boot, a new minimal x86 firmware for QEMU. > http://lwn.net/Articles/645455/ > https://github.com/bonzini/qboot > > q-boot is able to give a minimal booting time, with the help of > fw_cfg, by reading both the kernel and initrd image > from fw_cfg. > I guess ACPI support for both q-boot and qemu-x86 in u-boot can be > implemented on similar lines. ACPI support is now included in qboot. Paolo