Hi Momo, On Thu, 13 Oct 2022 at 13:35, momo aubin <[email protected]> wrote: > > Hi Simon, > > > On 12 Sep 2022, at 10:59 PM, momo aubin <[email protected]> wrote: > > > > > > > > Sent from my iPhone > > > >> On 12 Sep 2022, at 8:31 PM, Simon Glass <[email protected]> wrote: > >> > >> Hi Aubin, > >> > >>>> On Mon, 12 Sept 2022 at 09:13, momo aubin <[email protected]> wrote: > >>> > >>> > >>> > >>>> On Mon, 12 Sept 2022 at 17:07, Simon Glass <[email protected]> wrote: > >>>> > >>>> Hi Aubin, > >>>> > >>>> On Mon, 12 Sept 2022 at 08:23, momo aubin <[email protected]> wrote: > >>>>> > >>>>> Hi Simon, > >>>>> > >>>>> Thanks for your answer and explanations. > >>>>> > >>>>> The sequence of boot is : > >>>>> RBL->UBL->UBOOT->Kernel->ROOTFS. > >>>>> > >>>>> According to this sequence, ubl is the one who chooses which uboot > >>>>> needs to be started, then writing the script means writing them inside > >>>>> ubl. However, Ubl doesn't have access to the environment variable in > >>>>> order to know which u-boot has been used first. > >>>>> > >>>>> My question is . > >>>>> Is it possible to choose another u-boot (u-boot2) inside the first > >>>>> u-boot (u-boot1) ? > >>>> > >>>> Can you please try that reply again, without top posting? > >>>> > >>>> https://www.google.com/search?q=top+posting > >>>> > >>>> Regards, > >>>> Simon > >>>> > >>>> > >>>>> > >>>>> Regards, > >>>>> Aubin > >>>>> > >>>>> On Mon, 12 Sept 2022 at 15:35, Simon Glass <[email protected]> wrote: > >>>>>> > >>>>>> Hi Momo, > >>>>>> > >>>>>> On Sun, 11 Sept 2022 at 08:29, momo aubin <[email protected]> wrote: > >>>>>>> > >>>>>>> Hi Simon, > >>>>>>> > >>>>>>> Thanks for getting back to me. > >>>>>>> > >>>>>>> How can I avoid top posting ? i'm a new > >>>>>> > >>>>>> You can do a web search for "top posting" which explains the issue > >>>>>> better than I can. > >>>>>> > >>>>>>> > >>>>>>> How uboot know that the kernel has started ? > >>>>>> > >>>>>> Generally it does not. U-Boot's job is typically over once it jumps to > >>>>>> the kernel. > >>>>>> > >>>>>>> If the system is blocked during the u-boot stage, is it possible to > >>>>>>> restart all the systems ? > >>>>>>> It is possible to put a timer in the u-boot stage in case of the > >>>>>>> kernel has not started , can the system reboot by choosing another > >>>>>>> u-boot ? > >>>>>> > >>>>>> You can use a watchdog timer to reboot the system. It can be set up in > >>>>>> U-Boot, then it Linux does not kick it in time, it will cause a > >>>>>> reboot. To choose another U-Boot, you would need to do some scripting, > >>>>>> or use mender. There is some work on VBE going on (U-Boot standard > >>>>>> boot) but it will take a while to all land. > >>>>>> > >>>>>> Regards, > >>>>>> SImon > >>>>>> > >>>>>> > >>>>>>> > >>>>>>> > >>>>>>> Thanks for your answer in advance. > >>>>>>> Aubin > >>>>>>> > >>>>>>> > >>>>>>> On Tue, 30 Aug 2022 at 04:30, Simon Glass <[email protected]> wrote: > >>>>>>>> > >>>>>>>> Hi Aubin, > >>>>>>>> > >>>>>>>> On Mon, 29 Aug 2022 at 01:40, momo aubin <[email protected]> wrote: > >>>>>>>>> > >>>>>>>>> Hi Simon, > >>>>>>>>> I got what is the 'dm tree' which is a driver model. This command > >>>>>>>>> could be done only in uboot stage. but i got the situation in which > >>>>>>>>> the initialisation of u-boot has not finished yet as showing in the > >>>>>>>>> following picture. > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> .i would like to know what is wrong in the initialisation ? > >>>>>>>> > >>>>>>>> Please try to avoid top posting. > >>>>>>>> > >>>>>>>> I think the best thing is to move to the latest U-Boot. You are about > >>>>>>>> 9 years behind! But as to your question, I am really not sure. If it > >>>>>>>> is a TI board, you could try asking them? > >>>>>>>> > >>>>>>>> Regards, > >>>>>>>> Simon > >>>>>>>> > >>>>>>>> > >>>>>>>>> > >>>>>>>>> Best Regard, > >>>>>>>>> Aubin > >>>>>>>>> > >>>>>>>>> On Mon, 29 Aug 2022 at 05:24, momo aubin <[email protected]> wrote: > >>>>>>>>>> > >>>>>>>>>> Hi Simon, > >>>>>>>>>> > >>>>>>>>>> Thanks for your answer. > >>>>>>>>>> > >>>>>>>>>> The script that you are telling it is Env.txt right ? > >>>>>>>>>> > >>>>>>>>>> What is a 'dm tree' ? Please could you provide me more infos about > >>>>>>>>>> this ? > >>>>>>>>>> > >>>>>>>>>> Thanks for your answer in advance. > >>>>>>>>>> > >>>>>>>>>> On Sat, 27 Aug 2022 at 02:21, Simon Glass <[email protected]> > >>>>>>>>>> wrote: > >>>>>>>>>>> > >>>>>>>>>>> Hi Aubin, > >>>>>>>>>>> > >>>>>>>>>>> On Fri, 26 Aug 2022 at 06:41, momo aubin <[email protected]> > >>>>>>>>>>> wrote: > >>>>>>>>>>>> > >>>>>>>>>>>> Dear all, > >>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>> Is there any way that allows us to know that uboot has > >>>>>>>>>>>> initialised all his > >>>>>>>>>>>> peripherals before starting loading kernel ? > >>>>>>>>>>>> > >>>>>>>>>>>> The goal of this check is to reset the board in case of bad > >>>>>>>>>>>> initialisation > >>>>>>>>>>>> and choose a different uboot . > >>>>>>>>>>>> > >>>>>>>>>>>> Thanks for your answer in advance. > >>>>>>>>>>>> Aubin > >>>>>>>>>>> > >>>>>>>>>>> If there is a failure then it likely results in an error-return > >>>>>>>>>>> code > >>>>>>>>>>> from board_init_f() or board_init_r(). These generally halt > >>>>>>>>>>> U-Boot / > >>>>>>>>>>> cause a reboot. But this only covers the peripherals that U-Boot > >>>>>>>>>>> sets > >>>>>>>>>>> up early, like serial, clocks, pinctrl, MMC, PCI, etc. > >>>>>>>>>>> > >>>>>>>>>>> U-Boot typically does not init a peripheral unless it is needed > >>>>>>>>>>> for U-Boot. > >>>>>>>>>>> > >>>>>>>>>>> While U-Boot is running (e.g. a script) it may start up other > >>>>>>>>>>> peripherals (e.g. to read a kernel from USB) and in those cases > >>>>>>>>>>> errors > >>>>>>>>>>> can be handled by the script. > >>>>>>>>>>> > >>>>>>>>>>> You can use 'dm tree' to see what devices have been probed > >>>>>>>>>>> successfully. > >>>>>>>>>>> > >>>>>>>>>>> Regards, > >>>>>>>>>>> Simon > >>> > >>> > >>> Hi Simon, > >>> > >>> Thanks for your answer and explanations. > >>> > >>> The sequence of boot is : > >>> RBL->UBL->UBOOT->Kernel->ROOTFS. > >>> > >>> According to this sequence, ubl is the one who chooses which uboot needs > >>> to be started, then writing the script means writing them inside ubl. > >>> However, Ubl doesn't have access to the environment variable in order to > >>> know which u-boot has been used first. > >> > >> I don't know what RBL and UBL are. > >> > >>> > >>> My question is . > >>> Is it possible to choose another u-boot (u-boot2) inside the first u-boot > >>> (u-boot1) ? > >> > >> Yes you can jump from one U-Boot to another. Something like 'dcache > >> off; go <addr>' should work. > > I will implement a timer whenever the kernel won’t start the system will > > jump to another u-boot. > > > >> > >> > >>> > >>> Is this correct ? > >> > >> Regards, > >> Simon > > Thanks for your answer. > > When the system is running and we have two uboot in two différents partition, > is there a way to check if the second uboot is corrupted ? >
The VBE system is intended to implement all this, with SPL doing the check. See [1] for details, but it is still under development. For now you can script it, by hashing and then using the other one if the hash is wrong. Regards, Simon [1] https://u-boot.readthedocs.io/en/latest/develop/vbe.html?highlight=vbe > Thanks in advance for your answer.
