From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lonsn Date: Thu, 09 Sep 2004 00:23:51 +0800 Subject: [U-Boot-Users] Re: Using U-BOOT in CSB272 board In-Reply-To: <413EDC9D.26960.69974B1@localhost> References: <413EDC9D.26960.69974B1@localhost> Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi, Tolunay Thank you for your suggestions. > I am the maintainer of CSB272 port of U-Boot. I've done the port > based on technical info of the board which is not very reliable. > Unfortunately, Cogent generally is not very responsive to emails > regarding the ambiguous/outdated technical information about their > boards. > Some information is extracted by using BDI2000 after uMon > intitialized the hardware. Some information is based on datasheet of > the parts. > > This is actually a discontinued board. In our application here, we do > not use the Epson controller. We have switched to using CSB472 > now which is smaller and does not have the parts we do not use. Since we have chosen this board and I have to solve this problem. > On 8 Sep 2004 at 22:23, Lonsn wrote: > > >>then bootm, kernel panic at init EPSON1356 Display Controller, so I >>reset U-BOOT, I download kernel again > > > To me it sounds like your Epson1356 driver issue in Linux kernel. > You should debug the driver to find out what exactly within the driver > is causing the panic. > > Check the assumptions made by the driver. The particular driver > may be assuming that bootloader is doing a particular initialization > however a well written driver should not assume these and re- > inititialize the hardware suitably. It could also be a race condition or > an uninitialized variable. I will try to do it. > >>Should I pay attention to SDRAM init sequence in U-BOOT as Wolfgang has >>said many times? > > > As far as I know SDRAM initialization for CSB272 is correct. The > information supplied by Cogent in the tech. documentation is for > 32MB SDRAM (older) version of the board but your and my board > are 64MB. I also compared the sdram init code between U-BOOT and uMon, there aren't much differences except uMon delay 10ms after enable the memory bank at last. So I think it's not the question of sdram init. I will check the epson driver in kernel.