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.
