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Re: UART4 on Banapipro not working



Hi Karsten,

thanks for the quick reply. You guessed right. I am using Jessie. I just
tried the backported kernel 4.2. and it works. Just for the record on
the list: uart4 -> ttyS1

Thanks a lot,
Bernhard

Am 13.12.2015 um 19:12 schrieb Karsten Merker:
> On Sun, Dec 13, 2015 at 06:23:09PM +0100, Bernhard Seidl wrote:
> 
>> uart4 on banapipro is a very common uart since it's located at the
>> standard uart in raspberry B+ J8's pinout [1]
>>
>> I installed debian based on [2] via sd card. For further testing I
>> connected a uart<->USB cable. The cable worked perfectly on the
>> "console" header ttyS0. It seems to me that the function uart4 is not
>> set in the pinctrl:
>>
>> cat /sys/kernel/debug/pinctrl/1c20800.pinctrl/pinmux-pins |grep uart
>> pin 54 (PB22): 1c28000.serial (GPIO UNCLAIMED) function uart0 group PB22
>> pin 55 (PB23): 1c28000.serial (GPIO UNCLAIMED) function uart0 group PB23
>> pin 272 (PI16): 1c28800.serial (GPIO UNCLAIMED) function uart2 group PI16
>> pin 273 (PI17): 1c28800.serial (GPIO UNCLAIMED) function uart2 group PI17
>> pin 274 (PI18): 1c28800.serial (GPIO UNCLAIMED) function uart2 group PI18
>> pin 275 (PI19): 1c28800.serial (GPIO UNCLAIMED) function uart2 group PI19
>> pin 276 (PI20): 1c29c00.serial (GPIO UNCLAIMED) function uart7 group PI20
>> pin 277 (PI21): 1c29c00.serial (GPIO UNCLAIMED) function uart7 group PI21
>>
>> Am I missing a something? How can I activate the group?
> 
> Hello,
> 
> I assume that you are using Jessie? UART4 has been pinmuxed to
> PH4/PH5 on the BananaPro since kernel 4.1, but not before. 
> Jessie uses kernel 3.16, so this mux is not active there.
> 
> These are the two commits that changed the UART4 pinmuxing:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=869afa7f1743e4227c0c63c4200830933bbeec6d
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4528f5314b8be852e7b1c278042a5655375e39b4
> 
> HTH,
> Karsten
> 


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