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. > > Is this correct ? Regards, Simon
