From mboxrd@z Thu Jan 1 00:00:00 1970 From: Markus =?utf-8?Q?Klotzb=C3=BCcher?= Date: Wed, 26 Mar 2008 08:28:39 +0100 Subject: [U-Boot-Users] auto-save environment if using default environment? In-Reply-To: <47E98F70.5050003@magtech.com.au> (Aras Vaichas's message of "Wed\, 26 Mar 2008 10\:49\:04 +1100") References: <47E90DE8.15445.1113A3A@w.wegner.astro-kom.de> <20080325201613.8D7E8248BF@gemini.denx.de> <20080325231514.GA19940@leila.ping.de> <47E98F70.5050003@magtech.com.au> Message-ID: <87prtidjvc.fsf_-_@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Aras Vaichas writes: > Wolfgang Wegner wrote: >> On our board we have an FPGA, and for different applications a different >> FPGA file shall be loaded without updating the firmware. For this, the >> application has to set an U-Boot environment variable that specifies which >> FPGA file to load on next boot. >> > We use an i2c EEPROM to hold board specific information. I read the > EEPROM from U-Boot and set up the MAC address and arch/mach number using > the misc_init_r(void) call method. This separates the U-boot environment > from the machine specific data. I also use the EEPROM to hold the SDRAM > settings so the first bootloader can configure the DRAM on multiple > boards without requiring multiple binaries. > > I have a strange bootcmd. If U-Boot starts with a corrupted environment, > it runs the default bootcmd. The default bootcmd creates a bootcmd and > then runs saveenv so the next boot will run the new bootcmd.. Nice :-) That does the trick without any modifications to the code. Though I have to agree with Wolfgang that this could be potentially dangerous. If for any reason U-Boot went into some kind of endless restart - saveenv loop... Best regards Markus Klotzbuecher -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: office at denx.de