[meta-freescale] kernel stuck at start up on iMx6solo customized board

[Vahid Gharaee]

Hello Marc,
Thanks.
I tried that! no luck!
I used *imx6dl.dtsi* as header
and just added (*i2c*, *PMIC *and *UART) *but everything is the same.
(current consumption dropped 40mA though)
could you please tell me if there is a way for start with , as you said,
most basic dt ?
Thank you
Vahid


On Wed, Mar 6, 2019 at 5:53 PM Marc Ferland <marc.ferland at gmail.com> wrote:

> On Wed, Mar 6, 2019 at 7:41 AM Vahid Gharaee <vgharaee at gmail.com> wrote:
>
>> Hello everybody,
>>
>> I have a customized imx6 solo board. 1 GB of DDR3 ram and MMC for boot.
>>
>> I have ported u-boot(the fslc community one) and it seems to work fine. I
>> also run stress RAM test and it came out OK. (calibration data is used in
>> imximage.cfg)
>>
>> when I attempt to run kernel it stuck at "*starting kernel*" commands:
>>
>> >>ext4load mmc 0 ${loadaddr} zImage >>ext4load mmc 0 ${fdt_addr} *.dtb >>bootz ${loadaddr} - ${fdt_addr}
>>
>> (loadaddr=0x12000000 and fdt_addr=0x18000000 the bootargs has the right
>> ttymxc and baudrate value)
>>
>> with early printk it says: "*Uncompressing Linux... done, booting the
>> kernel.*"
>>
>> *printk* doesn't work, (Guess the initialize not done).
>>
>> Fortunately, I have some LEDs on board, so I tried to use them and trace
>> the code. the it seems it kernel hangs at enabling MMU:
>>
>> /arch/arm/kernel/head.S :
>>
>> . .     ENTRY(__turn_mmu_on)         mov r0, r0         instr_sync        mcr p15, 0, r0, c1, c0, 0         mrc p15, 0, r3, c0, c0, 0        instr_sync         mov r3, r3         mov r3, r13         ret r3     __turn_on_mmu_end     ENDPROC(__turn_mmu_on)`enter code here` ...
>>
>> those mcr and mrc are the point that i can toggle GPIObefore them and
>> not after!
>>
>> I should add: to toggling GPIO I used physical address before them and
>> virtual address after.(I also test with physical add) physical address: for
>> example 0x0209c000 -> gpio data register which virtual address is:
>> 0xf429c000 (just in iMX platform)
>>
>> also I disable i/d cache before boot up kernel. didn't know how to
>> disable MMU but according the u-boot it seems to be disabled.
>>
>> please help me find the solution.
>>
> This sometimes is a symptom of an error in the device-tree. Start with the
> most basic device-tree you can and then work your way up.
>
> Hope that helps.
>
> Marc
>
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