Sagar Heroorkar <sagar.heroor...@gmail.com> wrote on 2010/07/21 19:09:50: > > Hi, > > Is there a other way that without building the 2 different linking address for > the uboot to make the 2 uboots PIC in the same nor flash.
The only other way is to modify gcc so you don't need so many link_offs() calls. Jocke > On Wed, Jul 21, 2010 at 12:27 PM, Joakim Tjernlund > <joakim.tjernl...@transmode.se > > wrote: > Sagar Heroorkar <sagar.heroor...@gmail.com> wrote on 2010/07/21 17:21:31: > > > > Hi All, > > > > Before i start using your ( Joakim )approach. I would like to get some tips > > from Wolfgang or someone who can assist me here. > > > > I am working on nor flash which is 128 mb flash for the PPC4XX. > > > > My goal is to make uboot redundant. having other copy of uboot if one > > fails to boot. > > Architechure follows like this. > > > > Totally there will be 3 uboots. Golden uboot is the one which has > > basic logic > > to pick which uboot from uboot 1 or uboot 2 (different copy). > > uboot 1 and uboot 2 is flashed into some location of 16mb nor flash. > Seems sane. > > > > > Steps follows like this. > > > > 1)G-boot picks up uboot1/uboot2 based on environment variable. Basically we > > jumps to that uboot and start booting it from there. > Doesn't need to be an env var. I image one could mark each image (uboot 1 or > uboot 2) with a flag instead. That way you don't need to parse the env. > > > > > When i analysed the approach what Joakim implemented in http://www.mail- > > archive.com/u-boot@lists.denx.de/msg26918.html. > > He uses something like link_off() for each of the global data. > > > > * There will be too many link_offs() i have to use in uboot to make sure > > each > > of the global data. > There are a few link_offs() but not too many IMHO. Remember that my patches > were complete for my board. > > > * As i will have 2 uboots which resides into seperate partitions. This > > requies > > to build 2 uboots with different relotate_code logic/something . > Yes, this is the other way, you need to build two images linked to different > addresses and select the right one at install. > > > > > I have read comments about this approach in the link what i pasted above. > > > > I would really appriciate if anyone replies (especially Wolfgang ) about > > whether to go head with this approach before i spent much time on this. > > Also if anyone has already done similar implentation for any of the boards > let me know. > > > > -Sagar > > On Mon, Jul 19, 2010 at 4:36 PM, Joakim Tjernlund > > <joakim.tjernl...@transmode.se > > wrote: > > > > > > Sagar Heroorkar <sagar.heroor...@gmail.com> wrote on 2010/07/19 15:26:20: > > > > > > Hi Wlfgang, > > > > > > resending this. > > > > > > Please do reply > > > > > > -Sagar > > > > > On Fri, Jul 16, 2010 at 3:12 PM, Sagar Heroorkar > > > <sagar.heroor...@gmail.com> wrote: > > > Hi Joakim, > > > > > > Graeme referred me to contact you for this. > > > > > > I am working on U-boot making it PIC for ppc 405ex based boards. > > > I see in the following link > > > http://www.mail-archive.com/u-boot@lists.denx.de/ > > > msg26918.html > > > that you have implemented similar thing on 83xx board. > > > > > > I have downloaded latest u-boot from ftp server of denx. I dont see the > > > functions what you have modified like LINKF_OFF() etc. > > > I would like to know where is the source code for that. Also is there any > > > document other than the mail thread that explains what you have chagned. > > > Hi Sagar > > > > The source isn't in u-boot. It is only available as the patches I sent at > > the time. > > I don't have the patches handy as I am on vacation for 2 more weeks. > > > > > > > > Thanks in advance. > > > > > > -Sagar > > > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
