From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC463CA9EA9 for ; Sun, 20 Oct 2019 06:36:07 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 76F4820679 for ; Sun, 20 Oct 2019 06:36:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="Pf+1K6La" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 76F4820679 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:52004 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iM4ow-0005tI-Im for qemu-devel@archiver.kernel.org; Sun, 20 Oct 2019 02:36:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49894) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iM4nu-0004sV-Qg for qemu-devel@nongnu.org; Sun, 20 Oct 2019 02:35:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iM4nt-0004WY-9U for qemu-devel@nongnu.org; Sun, 20 Oct 2019 02:35:02 -0400 Received: from ozlabs.org ([203.11.71.1]:34473) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iM4nr-0004UP-WB; Sun, 20 Oct 2019 02:35:01 -0400 Received: by ozlabs.org (Postfix, from userid 1007) id 46wqkl55V7z9sPV; Sun, 20 Oct 2019 17:34:55 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1571553295; bh=kkNexIsabgC/Bz3awk0mxnyG/2Z+xkWztekNTwRCCKA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Pf+1K6LaQFCLyF04lYDaurGmhewCJtKcb6ObUy3UM2VKcAgmoI5MmXm6roS5KaRDK aQOgcfWulB5JO2RRueqmeB/4+ucmyL+OkggmD1oi+gYSKoBth6rECK7AebW+jzu6ce bMDN36xWts9nziB1I7iwSNGEBwlhjhOKaNS0qTyg= Date: Sun, 20 Oct 2019 17:24:16 +1100 From: David Gibson To: =?iso-8859-1?Q?C=E9dric?= Le Goater Subject: Re: qemu/powernv: coreboot support? Message-ID: <20191020062416.GG1960@umbus.fritz.box> References: <20191018172622.kz4smemh5cwesfit@proprietary-killer> <21ba3404-dcd3-fe06-7725-d58e249f9fd2@kaod.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="5UGlQXeG3ziZS81+" Content-Disposition: inline In-Reply-To: <21ba3404-dcd3-fe06-7725-d58e249f9fd2@kaod.org> User-Agent: Mutt/1.12.1 (2019-06-15) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 203.11.71.1 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Marty E. Plummer" , qemu-ppc@nongnu.org, qemu-devel@nongnu.org, Joel Stanley Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --5UGlQXeG3ziZS81+ Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Oct 19, 2019 at 03:46:59PM +0200, C=E9dric Le Goater wrote: > On 18/10/2019 19:28, Marty E. Plummer wrote: > > Hello, > >=20 > > First off, thank you for the work you've done on the ppc64 support, it > > has been very useful. I'm currently working on a coreboot port for the > > talos ii line of systems (which means more ppc64 support, support > > specifically for the power9 sforza chip, and specific mainboard support. > > My plate is very full lol) and have been using qemu to debug the > > bootblock. > >=20 > > It has been very useful for that, but I'm now at the point where I need > > to jump to romstage, and that's where it gets tricky. qemu parses the r= om > > image and looks for a ffs header, locates skiboot on it, and jumps stra= ight > > to that. Not exactly ideal for debugging something not produced from op= -build. >=20 > yes. I suppose you are using my branch powernv-4.2 which adds PNOR support > and a way to boot directly from PNOR. In that case, QEMU parses the PNOR > file to extract the PAYLOAD partition (skiboot). skiboot also detects the > flash and extract the kernel and initramfs from the PNOR. Ah! Now I understand. I hadn't looked at that branch, so I had no idea what all this pnor stuff was about. In mainline we just load skiboot as a normal firmware file and jump into it. > However, you can bypass all this internal boot process by simply passing > a -bios option and not passing a MTD device. Right. > I haven't published the PNOR support and the boot from PNOR yet. Lack > of time and because sPAPR is the priority. >=20 > > Do you think it would be within your wheelhouse to provide a generic, n= on-ffs > > pnor interface for loading arbitary rom images?=20 >=20 > I should probably send the PNOR patchset now so that we can discuss on=20 > a better way to satisfy all needs. =20 >=20 > > It would be of great help if > > you could. (This would still hopefully have the bmc support code as > > well, as I'm still needing to support a system using one). >=20 > We have support for Aspeed machines AST2400, AST2500 and AST2600. It=20 > is possible to interconnect them through the BT device. Or you can use > the IPMI BT simulator of QEMU on the PowerNV machine >=20 > Thanks, >=20 > C.=20 >=20 --=20 David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. 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