L4Re GPIO

Tue Dec 16 10:01:02 CET 2014

Thank you for the help in my last email. I want to continue the question
from my last email.

1. I want to QEMU to accept input from keyboard to emulate and study how to
use an configure of IO. I study this as a part of my main goal to access
GPIOs of Pandaboard. Well, in my last email i stated that i already include
x86-legacy.devs module in modules.list, and define
REQUIRES_LIBS=libc_be_file_stdin, and using "default-kernel fiasco
-serial_esc" defined. But, it still not respond to any of my keyboard
input. So, what did i miss?

2. I have modified omap3 driver that included in the package to be used
with omap4460 registers, but i have a few difficulties. There are few
missing registers (like Clr_irq_enable1 register that not present in
OMAP4460) and i am still cannot comprehend the scm_offset table. Because
when i crossreferencing the source with the OMAP3 TRM the i cannot
understand the value. My question is. Is it be able to use only some of the
defined register to do simple IO task, and enable or disable register ?

Below, i paste the link source :

http://pastebin.com/fPSmZQBu

Thank you for any suggestion and answer

2014-12-05 18:00 GMT+07:00 <l4-hackers-request at os.inf.tu-dresden.de>:
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> Today's Topics:
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>    1. Re: L4Re GPIO (Adam Lackorzynski)
>    2. Re: JDB percent CPU usage (Adam Lackorzynski)
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>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 4 Dec 2014 23:53:01 +0100
> From: Adam Lackorzynski <adam at os.inf.tu-dresden.de>
> To: l4-hackers at os.inf.tu-dresden.de
> Subject: Re: L4Re GPIO
> Message-ID: <20141204225301.GA4644 at os.inf.tu-dresden.de>
> Content-Type: text/plain; charset=iso-8859-1
>
> Hi,
>
> On Thu Dec 04, 2014 at 14:57:14 +0700, Erry Pradana Darajati wrote:
> > I have some follow up question from my last email.
> >
> > 1. About GPIO. So IOs defined on LUA script. So in OMAP4460, is gonna be
> > like this, isn't it ?
>
> Principally yes.
>
> >     I have a question in line of this code.
> >
> > GPIO = Hw.Device(function()
> >     GPIO1 = Hw.Gpio_omap46x_chip(function(
> > )
> >       hid = "gpio-omap46x-GPIO1";
> >       compatible = {"ti,omap4-gpio"};
> >       regs = Res.mmio(0x4A310000, 0x4A310194); // This one is range of
> > Address GPIO1 used
>
> Yes.
>
> >       irq = Res.irq(29); //This one is IRQ of GPIO1 ? What is the meaning
> > of irq(29) ?
>
> This is the IRQ number for the GPIO chip. The driver in IO will then
> generate IRQs for the specific pins by reading hardware registers of the
> GPIO chip.
>
> >       scm_table = 0; // I still don't understand about this line
>
> This selects the specific GPIO block. It is a driver-internal selection.
>
> >     end);
> > end);
> >
> > And where can i read the reference about another parameters of this ?
> (Like
> > there pins parameter in raspi b. And there are mems instead of regs)
>
> The specific ones are driver specific so you should check the driver in
> io (pkg/io/server/src/drivers/gpio/*).
>
> I guess a driver for the 4460 won't be so different from the omap3 one
> so maybe it can be modified.
>
> > 2. I try the L4Re with x86 build run in QEMU. And want it to accept my
> > keyboard input. So i need to include x86-legacy.devs module in
> modules.list
> > and define REQUIRES_LIBS=libc_be_file_stdin isn't it ?
> > But after i've done it, it still doesn't accept keyboard input. what did
> i
> > miss ?
>
> For what purpose do you want it to accept input? Maybe just a missing
> -serial_esc option on Fiasco's command line?
>
>
>
>
> Adam
> --
> Adam                 adam at os.inf.tu-dresden.de
>   Lackorzynski         http://os.inf.tu-dresden.de/~adam/
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 4 Dec 2014 23:57:32 +0100
> From: Adam Lackorzynski <adam at os.inf.tu-dresden.de>
> To: l4-hackers at os.inf.tu-dresden.de
> Subject: Re: JDB percent CPU usage
> Message-ID: <20141204225732.GB4644 at os.inf.tu-dresden.de>
> Content-Type: text/plain; charset=iso-8859-1
>
> Hi jason,
>
> On Wed Dec 03, 2014 at 20:11:03 -0500, teclis High Elf wrote:
> > Is there a way to get percent CPU usage (or any other resource usage )
> from
> > JDB? So if I suspect that one task has run amok and is monopolizing the
> CPU
> > I can search for it using JDB.
>
> CPU usage is not directly possible with jdb as jdb only has a current
> view with the system being stopped. What usually works quite ok is to
> check for 'ready' threads (with 'lp' jdb command) a couple
> of times and see if one or some are ready besides the kernel idle
> threads all the time.
>
>
>
> Adam
> --
> Adam                 adam at os.inf.tu-dresden.de
>   Lackorzynski         http://os.inf.tu-dresden.de/~adam/
>
>
>
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> End of l4-hackers Digest, Vol 140, Issue 5
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-- 
*Regards,*
*Erry Pradana Darajati | Student of Computer Engineering*
*Politeknik Elektronika Negeri Surabaya / EEPIS, Indonesia*
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