From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 08 Jan 2025 16:29:31 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tVXzu-000nDC-1l for lore@lore.pengutronix.de; Wed, 08 Jan 2025 16:29:31 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1tVXzu-0005Oe-Gq for lore@pengutronix.de; Wed, 08 Jan 2025 16:29:31 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Type:MIME-Version:References:Message-ID:Subject:To:From:Date:Reply-To :Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=honfIOjygV68Rc3h2oPUFsadt5qrQBtfpMLx7vYQUDI=; b=tnyDboDSmXGjch1mHRrSrRO2x7 jF6v+0Yg/dmI0pgPHiZHkEycxjv/fMkPBN1cuzi6GUcnqcWjHl4kQFgWjMgy7reP1+w1VswUo43Sh niK0ImmWSAvo1g5Xq7QOgCw83ji6KHwgi6SHpy2YPuNzS7XpluCGQ3CgMf+2nq2IJT58vfVQ6a9n3 rE5iZLw/TKpoOani/dS4lbFYvYEOEblni9ygnaGbFDAXMZhfV49oxyCfdVnaTzfO27cGMEBqkZFlP hzLJINxYj7FnWVSr4kVdEs2MamKDY4o4dcTwBuMH3sGi6+sU0zud7ppdmABYlNbVEBXCXtrPxX24q RH/7Xbzw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tVXzV-00000008yF1-116K; Wed, 08 Jan 2025 15:29:05 +0000 Received: from mail.inside-m2m.de ([188.68.57.244]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tVXyI-00000008y04-1rR7 for barebox@lists.infradead.org; Wed, 08 Jan 2025 15:27:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=inside-m2m.de; s=default; t=1736350039; bh=Zbkj0Q1IDj+vodk6txPHyf2zp8TpcI2lgbLM8c03jo0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EOqAAbLJXmsiTSp1U/UIp3OjGdV7rYST9vFyceZc4xj8JgqCCoGkbC7dJnn0NwsHG czjZcXuRbYufMm6DNxLGgUhHfT5p8hcvfvpISiPnTZU1GnfG7FyVE0SvXGog0S2KN7 pkyOtOni8ysmIbUOze1AELfF+J2KzQTFuRXiTypMV+1B215mU3oG96LhuCTdGp9EYs 7T6vowub0OoyelBKsBdZ1gsleS6sGNYrd04+8k0FZh/6DW+wE8Jht2mMzPI4PXn4DW aS+N30ps7B2gbEFHyd8WdoPeuijlKslCvEleUC3jpcHtQjeXeuPN+AqR5x824uG4BY rCiJqA2YcXm9g== Received: from hephaistos (business-90-187-159-109.pool2.vodafone-ip.de [90.187.159.109]) (Authenticated sender: konstantin.kletschke@inside-m2m.de) by mail.inside-m2m.de (Postfix) with ESMTPSA id EC784400E1; Wed, 8 Jan 2025 16:27:18 +0100 (CET) Date: Wed, 8 Jan 2025 16:27:17 +0100 From: Konstantin Kletschke To: Ahmad Fatoum Message-ID: References: <63ac6399-be23-40c5-a2d4-d995999b5d7a@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <63ac6399-be23-40c5-a2d4-d995999b5d7a@pengutronix.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250108_072750_621676_AAA3ED54 X-CRM114-Status: GOOD ( 12.04 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: barebox@lists.infradead.org Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.6 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH] ARM: beaglebone: add delay in lowlevel.c X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) More like this? On Wed, Jan 08, 2025 at 04:19:49PM +0100, Ahmad Fatoum wrote: > > It would be nice to have the comment more verbose. e.g. that this issue > was observed on new Seeed-produced BBBs is an intersting info IMO. arch/arm/boards/beaglebone/lowlevel.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/arm/boards/beaglebone/lowlevel.c b/arch/arm/boards/beaglebone/lowlevel.c index 5dc49dfaaf..7dc338d03a 100644 --- a/arch/arm/boards/beaglebone/lowlevel.c +++ b/arch/arm/boards/beaglebone/lowlevel.c @@ -97,6 +97,12 @@ extern char __dtb_z_am335x_boneblack_start[]; extern char __dtb_z_am335x_bone_common_start[]; extern char __dtb_z_am335x_bone_start[]; +static void __udelay(int us) +{ + volatile int i; + for (i = 0; i < us; i++); +} + /** * @brief The basic entry point for board initialization. * @@ -135,6 +141,12 @@ static noinline int beaglebone_sram_init(void) am33xx_enable_uart0_pin_mux(); omap_debug_ll_init(); putc_ll('>'); + /* + * Some (~5%) Beaglebone Black received from SEEED in batches + * after autumn 2024 require a delay to be able to warm start + * after reset + */ + __udelay(3000); barebox_arm_entry(0x80000000, sdram_size, fdt); }