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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0425CCDB466 for ; Thu, 25 Jun 2026 06:36:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=iccqRVwxvhQewqfPMfK2FxEEJuivEneqQEGd1Rf7CFw=; b=xISA94MFY3fH5pwJC8xwmSbp08 WX6AnJM5GiuRsCocHSWx4BH+8IDVYfrYjiZdP1qDmLBfn+KF4R0ZZHIjm/Td1urFLNZnsODL9P0hi sO6rCnGNdkV1B3pPt/kPDQoHzqO5/inCiC4PuIR3POvtDx4zkoY5u9mEGGSv19K+mCRXh+o4yonBi dokNcF2H6whBY1fhnD2QfnVNKPIZxFER40og4mmIbuEAMN7aTUBRc5loTYof5m7FTWqj1zoqjQVWN Pv9uYnMuFICJKnXrMQEI3MDW2p3NooU4RLuB8WEs09VTEzp5TKUqflwMQkCprHnOp7EthGAVCqhza dz6Vn33Q==; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 24/06/2026 14:48, Grégoire Layet wrote: > Hi Krzysztof, > >> What does that mean? How UART can be accessible over PCI bus? > > It's a Virtual UART. Internally, it's two FIFOs accessible via > 8250-compatible register sets on both ends. I do not know what is Virtual UART... > There is 4 Virtuals UARTs on the LPC bus of the AST2600 and 2 of them > are bridged over the PCI bus. > So, from the host, you can access the 8250 register set on the PCI bus. You mean these appear (or are) as PCI devices? > Best regards, Krzysztof