* Debug UART for arm64 ?
@ 2015-09-26 6:24 Masahiro Yamada
2015-09-26 7:02 ` Leo Yan
0 siblings, 1 reply; 3+ messages in thread
From: Masahiro Yamada @ 2015-09-26 6:24 UTC (permalink / raw)
To: linux-arm-kernel
Hi.
Forgive me if I am asking a silly question.
I will have to port ARM64 Linux on our new SoC.
This is my first work on ARM64 Linux,
so I have no experience with it yet.
When I worked on ARM32 Linux porting for the first time,
lowlevel-debug UART (CONFIG_DEBUG_LL) was very useful for me.
With my quick search under arch/arm64/ directory,
I could not find an equivalent one for ARM64.
Is debug UART available for ARM64?
Or, is there any other recommended easy-to-use debug facility
when something like a JTAG-debugger is unavailable.
--
Best Regards
Masahiro Yamada
^ permalink raw reply [flat|nested] 3+ messages in thread
* Debug UART for arm64 ?
2015-09-26 6:24 Debug UART for arm64 ? Masahiro Yamada
@ 2015-09-26 7:02 ` Leo Yan
2015-09-27 7:49 ` Masahiro Yamada
0 siblings, 1 reply; 3+ messages in thread
From: Leo Yan @ 2015-09-26 7:02 UTC (permalink / raw)
To: linux-arm-kernel
Hi,
On Sat, Sep 26, 2015 at 03:24:35PM +0900, Masahiro Yamada wrote:
> Forgive me if I am asking a silly question.
>
>
> I will have to port ARM64 Linux on our new SoC.
> This is my first work on ARM64 Linux,
> so I have no experience with it yet.
>
> When I worked on ARM32 Linux porting for the first time,
> lowlevel-debug UART (CONFIG_DEBUG_LL) was very useful for me.
>
> With my quick search under arch/arm64/ directory,
> I could not find an equivalent one for ARM64.
>
>
> Is debug UART available for ARM64?
> Or, is there any other recommended easy-to-use debug facility
> when something like a JTAG-debugger is unavailable.
drivers/tty/serial/earlycon.c is like what you are looking for.
Thanks,
Leo Yan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Debug UART for arm64 ?
2015-09-26 7:02 ` Leo Yan
@ 2015-09-27 7:49 ` Masahiro Yamada
0 siblings, 0 replies; 3+ messages in thread
From: Masahiro Yamada @ 2015-09-27 7:49 UTC (permalink / raw)
To: linux-arm-kernel
Hi Leo,
2015-09-26 16:02 GMT+09:00 Leo Yan <leo.yan@linaro.org>:
> Hi,
>
> On Sat, Sep 26, 2015 at 03:24:35PM +0900, Masahiro Yamada wrote:
>> Forgive me if I am asking a silly question.
>>
>>
>> I will have to port ARM64 Linux on our new SoC.
>> This is my first work on ARM64 Linux,
>> so I have no experience with it yet.
>>
>> When I worked on ARM32 Linux porting for the first time,
>> lowlevel-debug UART (CONFIG_DEBUG_LL) was very useful for me.
>>
>> With my quick search under arch/arm64/ directory,
>> I could not find an equivalent one for ARM64.
>>
>>
>> Is debug UART available for ARM64?
>> Or, is there any other recommended easy-to-use debug facility
>> when something like a JTAG-debugger is unavailable.
>
> drivers/tty/serial/earlycon.c is like what you are looking for.
I will try this.
Thanks!
--
Best Regards
Masahiro Yamada
^ permalink raw reply [flat|nested] 3+ messages in thread
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