On 31.05.16 09:40, Michal Simek wrote: > On 31.5.2016 08:39, Alexander Graf wrote: >> >> >>> Am 31.05.2016 um 07:04 schrieb Michal Simek <michal.si...@xilinx.com>: >>> >>>> On 30.5.2016 21:36, Alexander Graf wrote: >>>> >>>> >>>>> On 05/30/2016 04:11 PM, Michal Simek wrote: >>>>> Setup flag when default environment are used to be able to >>>>> rewrite default distro boot variables based on SoC boot mode. >>>>> >>>>> Signed-off-by: Michal Simek <michal.si...@xilinx.com> >>>>> --- >>>>> >>>>> I didn't find any way how to detect that default or saved variables are >>>>> used. I want to have a flag to be able to rewrite boot_targets variable >>>>> based on boot mode. Especially when SD boot mode is setup than SD should >>>>> be primary boot devices, etc. >>>>> When variables are saved boot_targets will be restored and SoC boot mode >>>>> will be ignored. >>>>> If you know better way how to do it, please let me know. >>>> >>>> You may want to be able to do the same from inside a script, so I guess >>>> we should better have this as an environment variable itself again. >>> >>> Was there any environment in past? >> >> With again I meant "from C as well as from script". >> >>>> >>>> There was a way to have environment variable reads return a value >>>> directly from code rather than go via environment storage. I guess we >>>> could expose the flag through that? >>> >>> If you expose environment variable and then run saveenv this variable >>> will be saved and restored again and your script behaves the same. >> >> Not if we declare the environment variable read as callback ;). > > What do you mean?
Meh, apparently I misremembered. > It is kind of interesting that this is not done already for others SoCs > when you want to use distro config. :-) Well, there's always a first :). Either way, I guess your patch is perfectly fine as a first step. It would be nice to also introduce some way for scripts to evaluate whether the environment is the default environment, but we can always add that later. Alex _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
