[U-Boot] [PATCH V2] imx: mx7: Add support for USB and normal boot modes

[Troy Kisky]

On 8/31/2017 6:56 AM, Fabio Estevam wrote:
> On Thu, Aug 31, 2017 at 10:35 AM, Fabio Estevam <festevam at gmail.com> wrote:
>> Hi Eric,
>>
>> On Wed, Aug 30, 2017 at 7:13 PM, Eric Nelson <eric at nelint.com> wrote:
>>> This adds support for two additional boot modes on the i.MX7D SoC, which
>>> is most useful when doing U-Boot development on this chip.
>>>
>>> 1. "bmode usb" can be used to force the ROM boot loader's serial
>>> 2. "bmode normal" can be used to revert to the normal boot mode
>>>    as specified by fuses and BOOT_MODE pins
>>>
>>> Signed-off-by: Eric Nelson <eric at nelint.com>
>>
>> I tried testing your patch on a imx7d sabresd, but it seems there is
>> an issue with bmode that is unrelated to your patch.
>>
>> I also did:
>>
>> diff --git a/configs/mx7dsabresd_defconfig b/configs/mx7dsabresd_defconfig
>> index 8f2e33a..c70fde8 100644
>> --- a/configs/mx7dsabresd_defconfig
>> +++ b/configs/mx7dsabresd_defconfig
>> @@ -5,7 +5,6 @@ CONFIG_VIDEO=y
>>  # CONFIG_ARMV7_VIRT is not set
>>  CONFIG_IMX_RDC=y
>>  CONFIG_IMX_BOOTAUX=y
>> -# CONFIG_CMD_BMODE is not set
>>  CONFIG_DEFAULT_DEVICE_TREE="imx7d-sdb"
>>  CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx7dsabresd/imximage.cfg"
>>  CONFIG_BOOTDELAY=3
>>
>> so that bmode command can be added.
>>
>> However I am getting:
>>
>> => bmode usb
>> bmode - <NULL>
> 
> I missed to add 'add_board_boot_modes(board_boot_modes);'
> 
> Now I get:
> 
> => bmode usb
> resetting ...
> 
> 
> U-Boot 2017.09-rc2-36996-g63af4b0-dirty (Aug 31 2017 - 10:53:12 -0300)
> 
> CPU:   Freescale i.MX7D rev1.2 1000 MHz (running at 792 MHz)
> CPU:   Commercial temperature grade (0C to 95C) at 41C
> Reset cause: POR
> Model: Freescale i.MX7 SabreSD Board
> Board: i.MX7D SABRESD in non-secure mode
> DRAM:  1 GiB
> PMIC: PFUZE3000 DEV_ID=0x30 REV_ID=0x11
> MMC:
> MMC Device 0 not found
> *** Warning - No MMC card found, using default environment
> 
> Video: 480x272x24
> In:    serial
> Out:   serial
> Err:   serial
> Net:   FEC0
> Hit any key to stop autoboot:  0
> =>
> 
> So the board is resetting instead of going into serial download mode.
> 
> Any ideas?
> 
>


I got this response from Peng when I asked him back in March of last year.


> For now, bmode does not work. Since bmode use warm reset, but we now use
> wdog to directly reset pmic. So bmode will not work.
>
> Please check your code to see whether your board connect WDOG_B to pmic reset pin and have wdog
pinmux settings.
>
> Thanks,
> Peng.



Maybe if you change the WDOG pinmux it might work ?


Troy