Hello,
On 6/4/20 12:14 AM, john@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx wrote:
> Hi Ahmad
>
> I got a little further and although there's still no serial output on UART1, I at least now see an error message about it (on UART0 still).
>
> ns16550_serial 3f215040.serial@xxxxxxxxxxx: probe failed: Device or resource busy
Drivers request the MMIO region they want to work with. Try the iomem command to see
if the EBUSY is due to a resource clash on 0x7e215040. Although I wonder how that
came about. Normally, with device tree, this shouldn't happen unless the device
tree is faulty.
> So your point about setting CONSOLE_ACTIVATE_NONE was correct 😊. Maybe I've missed something in the device trees, but am at least heartened to see something printed.
Can't take credit, because I don't know why this would cause an error message to be
printed, when none was printed before.
Keep us posted.
Cheers
Ahmad
>
> Thanks
>
> John
>
> -----Original Message-----
> From: barebox <barebox-bounces@xxxxxxxxxxxxxxxxxxx> On Behalf Of Ahmad Fatoum
> Sent: 02 June 2020 11:12
> To: john@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx <andrew@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>; barebox@xxxxxxxxxxxxxxxxxxx
> Subject: Re: Mini UART support for Raspberry Pi CM3 ?
>
> On 6/2/20 11:57 AM, john@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx wrote:
>> Hi Ahmad
>>
>> I have been using v2020.05 but I believe I had enabled all consoles so
>> I'll try setting it to none and see how that goes.
>
> This will only fix the use of UART0 as output. To use UART1, you'll need to set stdout-path = &uart1 like ab76f9d09d3b ("ARM: rpi: choose miniuart as
> stdout") does.
>
> Cheers
> Ahmad
>
>>
>> Thanks
>>
>> John
>>
>> -----Original Message-----
>> From: barebox <barebox-bounces@xxxxxxxxxxxxxxxxxxx> On Behalf Of Ahmad
>> Fatoum
>> Sent: 02 June 2020 10:55
>> To: john@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> <andrew@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>; barebox@xxxxxxxxxxxxxxxxxxx
>> Subject: Re: Mini UART support for Raspberry Pi CM3 ?
>>
>> On 6/2/20 11:43 AM, Ahmad Fatoum wrote:
>>> On 6/2/20 11:14 AM, john@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx wrote:
>>>> Hi
>>>>
>>>> I have been trying to get the mini UART (UART1) to work in Barebox
>>>> on the RPI Compute Module 3+. I already have the changes made in
>>>> config.txt and this works fine when I boot into the main Linux code.
>>>> However, in Barebox, the output always comes out on the main UART
>>>> (UART0) and that is wired to the Bluetooth module on my platform. I
>>>> have
>> tried modifying the device
>>>> trees and cannot seem to get any output. I also ensured that I added
>> the
>>>> RPI CM3 output target as a config in rpi_defconfig.
>>>>
>>>> I've tried turning off the PL011 config option and also changing the
>>>> device tree to reference UART1 and set the chosen stdout-path to
>>>> point to this UART, but when I do this I just get a lack of any
>>>> serial
>> output.
>>>>
>>>> I am also wanting to use the alternate pins (32 & 33) for UART1, so
>>>> I am thinking that something else needs to be changed. Has anyone
>>>> managed to get this to work?
>>>
>>> Which barebox version are you on? v2020.03.0 contains a series for
>>> mini UART support culminating in ab76f9d09d3b ("ARM: rpi: choose
>>> miniuart as stdout"), which sounds like something you will want to have.
>>
>> Oh, I see now that this is in since v2019.03.0. I assume you are
>> already on a newer version?
>>
>>> Also what's you "Console activation strategy"? (Kconfig symbols
>>> CONSOLE_ACTIVATE_.*) You'll want to have CONSOLE_ACTIVATE_NONE, so
>>> only the stdout-path from the device tree is activated by default.
>>>
>>> Cheers
>>> Ahmad
>>>
>>>>
>>>> Regards
>>>>
>>>> John
>>>>
>>>>
>>>> _______________________________________________
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>>>> barebox@xxxxxxxxxxxxxxxxxxx
>>>> http://lists.infradead.org/mailman/listinfo/barebox
>>>>
>>>
>>
>
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