From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from exchange.timesys.com (mail.timesys.com [65.117.135.102]) by ozlabs.org (Postfix) with ESMTP id 3F84D67A64 for ; Tue, 29 Mar 2005 02:07:02 +1000 (EST) From: "Walter L. Wimer III" To: Mike Rapoport In-Reply-To: <42467D8A.8050606@compulab.co.il> References: <42467D8A.8050606@compulab.co.il> Content-Type: text/plain Date: Mon, 28 Mar 2005 11:06:59 -0500 Message-Id: <1112026020.25896.8.camel@excalibur.timesys.com> Mime-Version: 1.0 Cc: linuxppc-embedded@ozlabs.org Subject: Re: Problem running Linux 2.6.11 on MPC8272ADS List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi Mike, I had the same "hang" experience. The file arch/ppc/platforms/pq2ads.c contains the following function: void __init m82xx_board_setup(void) { /* Enable the 2nd UART port */ *(volatile uint *)(BCSR_ADDR + 4) &= ~BCSR1_RS232_EN2; } I had to ifdef-out the assignment statement above. It appears that the definition for BCSR_ADDR in the kernel code differs from what U-Boot is using, and that area of memory isn't properly mapped into the kernel address space this early in the boot sequence. As a result, I was getting an Oops() before the console was even enabled (I could see the Oops message by examining the kernel's printk log buffer using a BDI-2000 hardware debugger). Good luck, Walt Wimer TimeSys Corporation On Sun, 2005-03-27 at 11:31 +0200, Mike Rapoport wrote: > Hi, > I'm trying to bring up the Linux 2.6.11 on MPC8272ADS and it seem to > hang up at the very beginning. > I use ads8272_defconfig and then enable console on SCC: > > CONFIG_SERIAL_CPM=y > CONFIG_SERIAL_CPM_CONSOLE=y > CONFIG_SERIAL_CPM_SCC1=y > > > when I boot the kernel from the u-boot the system hangs up right after > the kernel decompression. >