From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 75939193062 for ; Thu, 5 Sep 2024 08:26:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725524762; cv=none; b=Sn8m/eabapJqqiIUqLFxCm2iXPKRrZhdF6nxw0q+o+/erxoJxxmf0v95vCifDYYQaTxw0IJK80BEEsgHBDA3QPZReauT5VBFTCHtbMOSHIooPgclMz1TB2U1/VbkEEUW47VLWJbleHbq5sVrb3tQcOr0r3YAXRD9D27jiVSVOiU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725524762; c=relaxed/simple; bh=pbx93MrqsIt70cukyRfMc+V3+K3qJVVLWq8JU33+iJE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=l/gB8nsj1CABSSTZ0scF7hBsPTtrsaY+5svol9w1CRkFayJdit5CJB7gfamPvZaV3Aw27bhAKEprJ0ccBQ3WmQP2DzcGvc4xFZL4HqU5RJt27dKc+9ouYAaCEwEfgrtIM8pdcUG9Uuu+dXmfq7zSLPxCjycpeQa9p9T6ZCuBJLs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ju2+cVSj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ju2+cVSj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 72ECEC4CEC4; Thu, 5 Sep 2024 08:26:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1725524762; bh=pbx93MrqsIt70cukyRfMc+V3+K3qJVVLWq8JU33+iJE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ju2+cVSjeDNHMzA0+qfXmcRny58I2Iq5Z2FmLEN6h9jbKDHPLfZeCh7zbALoAs9CI 5TTnEa0ODuzlhVOtS1xSIeNmqlr4wNYr6nnUcWxzlMgOe5dgjD/GggFqVQ+awcx3qz ck/fG034MXmyCxB6Ru8jpBD1hR+P+Pu0pONwtGeM= Date: Thu, 5 Sep 2024 10:25:58 +0200 From: Greg KH To: Radisson97@web.de Cc: linux-serial@vger.kernel.org Subject: Re: possible regression with rs485 usage Message-ID: <2024090555-dispatch-recent-b3ad@gregkh> References: Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Sep 05, 2024 at 10:15:12AM +0200, Radisson97@web.de wrote: > Hi, i am new to this list because i have a strange problem. > > We have an embedded board based on the omap3-design with a rs485. > With kernel 3.5 it works fine. Since 3.5 is ancient we are noe trying > to get a new kernel up an running what is 5.8. Any specific reason why 5.8? That too is ancient and obsolete and not supported by anyone. > I turns out that the rs485 has issues (it seems a lot of ppl have > the same issue also with other boards). We enable the rs485 via ioctl() > and nothing seems to work. Several restarts, playing with Marcin Niestroyj's > rs485config it suddenly works. (yes hardware is ok, works with older kernel). So it does work? What exact hardware and drivers are you using? And can you try a modern and supported kernel version please? We can't do anything with 5.8 :( thanks, greg k-h