From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from helium.openadk.org (helium.openadk.org [89.238.66.15]) (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 1855E202F71 for ; Sun, 1 Feb 2026 18:39:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=89.238.66.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769971162; cv=none; b=dTG7fcFOwolmuS8QOyzspqOS4rFgbrbKFRJcrKpbVtUuzxnvlJuevcTFAUZftFrA67ioReB84Bf6KQy94iOnc57xjqCDsHWKl0ya3646GSgAyUBQZTZJyntVZtgICVEdgHOiGNaAZY1+zzKMWUnQsKA2xsU6cwMwQ5B/lSkQXjo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769971162; c=relaxed/simple; bh=TIyQBrsaCFHDWoyiOSw3i/5MGiOXssoNqXJpcPOYfx0=; h=Date:From:To:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=R/uC3dGIIeC1v3HYLMUs77Qi9VkS9KgdZJEBxXsXqmhM+tr19pTTIMSSyHF5+R2NVDDHvrXhLbVLr8xxUMiOcFLdsCJ/fWbEmwu0NNowFw6mhwy3/pHoonwaA4IfIr/pUWYB0vQY1pVPax4XoI37W8CygpbVPGzQb/T7dY8rBoE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=openadk.org; spf=pass smtp.mailfrom=openadk.org; dkim=fail (0-bit key) header.d=openadk.org header.i=@openadk.org header.b=nHe54crD reason="key not found in DNS"; arc=none smtp.client-ip=89.238.66.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=openadk.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=openadk.org Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=openadk.org header.i=@openadk.org header.b="nHe54crD" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=openadk.org; s=2022; t=1769971153; bh=TIyQBrsaCFHDWoyiOSw3i/5MGiOXssoNqXJpcPOYfx0=; h=Date:From:To:Subject:From; b=nHe54crDtil+bB3XtGnxE0DD2na6LDHzdPeVLd+VrVisHiR1JL7d0/ki/XlorzpKw uznZecKFESlOnbKj2wSH8fd/F7CJ4jd5J8u8d3j1ZB1o4hTOj7b8XANJ83uHf0kGtA wKkt2daBTIWcQU3MM3QS6xAq3ku1MBQna2M3Blj3iV+LHsNC1VjR9XU8ncx4E9KN8x bMDOXem1kMKPbEDoc2WLSEEQ9OEvgGqzdvK0z9zN3DCnVChn5fl/RI35ghuXQeOv2O PiiG90rze3C2E0GnNScVV5gPesTOjcUMOaY943ogDe6D0J4wYKNnH3nQvaV3mQgoAJ Oivvmr0a+rOGA== Received: by helium.openadk.org (Postfix, from userid 1000) id 8AEF831E0B83; Sun, 01 Feb 2026 19:39:13 +0100 (CET) Date: Sun, 1 Feb 2026 19:39:13 +0100 From: Waldemar Brodkorb To: linux-mips@vger.kernel.org Subject: serial console on Mikrotik RB532 non-working Message-ID: Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline X-Operating-System: Linux 6.12.63+deb13-amd64 x86_64 Hi MIPS hackers, I want to use the latest Linux kernel on my Mikrotik RB532, but the serial console is non working. I bisected the problem and the first breaking change is this commit: 6e690d54cfa802f939cefbd2fa2c91bd0b8bd1b6 is the first bad commit commit 6e690d54cfa802f939cefbd2fa2c91bd0b8bd1b6 Author: Yi Yang Date: Tue Jun 28 16:35:15 2022 +0800 serial: 8250: fix return error code in serial8250_request_std_resource() If port->mapbase = NULL in serial8250_request_std_resource() , it need return a error code instead of 0. If uart_set_info() fail to request new regions by serial8250_request_std_resource() but the return value of serial8250_request_std_resource() is 0, The system incorrectly considers that the resource application is successful and does not attempt to restore the old setting. A null pointer reference is triggered when the port resource is later invoked. Signed-off-by: Yi Yang Cc: stable Link: https://lore.kernel.org/r/20220628083515.64138-1-yiyang13@huawei.com Signed-off-by: Greg Kroah-Hartman drivers/tty/serial/8250/8250_port.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) When I compile the commit before this commit everything is fine. When I just try to revert it on master I still get no output on my serial console. Anyone here have an idea what is defect in arch/mips/rb532 nowadays? Thanks in advance, Waldemar