From patchwork Thu Mar 3 09:11:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Peter Hoyes X-Patchwork-Id: 4619 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20AF1C433EF for ; Thu, 3 Mar 2022 09:12:13 +0000 (UTC) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mx.groups.io with SMTP id smtpd.web09.9010.1646298731894025675 for ; Thu, 03 Mar 2022 01:12:12 -0800 Authentication-Results: mx.groups.io; dkim=missing; spf=pass (domain: arm.com, ip: 217.140.110.172, mailfrom: peter.hoyes@arm.com) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 64DCC1480; Thu, 3 Mar 2022 01:12:11 -0800 (PST) Received: from e125920.cambridge.arm.com (e125920.cambridge.arm.com [10.1.199.58]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id B0A533F73D; Thu, 3 Mar 2022 01:12:10 -0800 (PST) From: Peter Hoyes To: meta-arm@lists.yoctoproject.org Cc: diego.sueiro@arm.com, robbie.cao@arm.com, Peter Hoyes Subject: [PATCH 1/2] arm-bsp/docs: Improve fvp-baser-aemv864 limitation Date: Thu, 3 Mar 2022 09:11:43 +0000 Message-Id: <20220303091144.473704-1-peter.hoyes@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 List-Id: X-Webhook-Received: from li982-79.members.linode.com [45.33.32.79] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Thu, 03 Mar 2022 09:12:13 -0000 X-Groupsio-URL: https://lists.yoctoproject.org/g/meta-arm/message/3093 From: Peter Hoyes Add more details about the cache_state_modelled limitation, which can be worked around by setting cci400.force_on_from_start=1 Issue-Id: SCM-3871 Signed-off-by: Peter Hoyes Change-Id: Idde23278a87316dae842c6c3793b9836482e8c3a --- meta-arm-bsp/documentation/fvp-baser-aemv8r64.md | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/meta-arm-bsp/documentation/fvp-baser-aemv8r64.md b/meta-arm-bsp/documentation/fvp-baser-aemv8r64.md index 85fabe5..44c755e 100644 --- a/meta-arm-bsp/documentation/fvp-baser-aemv8r64.md +++ b/meta-arm-bsp/documentation/fvp-baser-aemv8r64.md @@ -217,8 +217,11 @@ Known Issues and Limitations - Only PSCI CPU\_ON and CPU\_OFF functions are supported - Linux kernel does not support booting from secure EL2 on Armv8-R AArch64 - Linux KVM does not support Armv8-R AArch64 -- Enabling the FVP parameter `cache_state_modelled` is incompatible with virtio - devices +- Device DMA memory cache-coherence issue: the FVP cache_state_modelled + parameter will affect the cache coherence behavior of peripherals’ DMA. When + users set cache_state_modelled=1, they also have to set + cci400.force_on_from_start=1 to force the FVP to enable snooping on upstream + ports. Change Log ----------