Hello,
I would like to ask your advise concerning modifying ip address:
I need to modify ip address and ethernet address according to some
hardware input in application. This change can be done in u-boot or
linux.
When I consider where is the best place to set the ip/mac address (
u-boot or
Hello,
Is it legal to change ip address mac address when working with NFS,
and after linux finished startup ?
It seems that in such case, NFS can get stuck, right?
Thank you, Ran
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Hi,
Thanks very much for the detailed answer. If I may ask one more on
this issue please...
I am required to put some external device (led brightness) into
minimal brightness when the system gets to idle.
The control on led brightness value is done as part of dedicated
character device which was
Hello
What does it mean device without wakeup source in terms of runtime PM ?
Thanks,
Ran
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On Sun, Sep 7, 2014 at 11:36 PM, AYAN KUMAR HALDER ayankum...@gmail.com wrote:
On Mon, Sep 8, 2014 at 1:50 AM, Ran Shalit ransha...@gmail.com wrote:
On Sun, Sep 7, 2014 at 11:14 PM, AYAN KUMAR HALDER ayankum...@gmail.com
wrote:
On Sat, Sep 6, 2014 at 9:56 PM, Ran Shalit ransha...@gmail.com
Hello,
Is there any character device example using runtime PM available ?
It is most helpful,
Thanks,
Ran
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On Mon, Sep 8, 2014 at 9:43 PM, AYAN KUMAR HALDER ayankum...@gmail.com wrote:
How should a wakeup source for a device be configured in code.
I could not find it documented anywhere.
Check out drivers/input/keyboard/samsung-keypad.c. It is configured as
a wakeup source:-
1.
On Tue, Sep 9, 2014 at 8:44 PM, AYAN KUMAR HALDER ayankum...@gmail.com wrote:
Now, the thing I don't yet understand is what the wakeup source means
in this configuration. Wakeup only for a specific device driver ?
Wakeup source has its relevance mostly for system suspend/resume where in
a
On Tue, Sep 9, 2014 at 8:48 PM, AYAN KUMAR HALDER ayankum...@gmail.com wrote:
Is the wakeup source relevant only for suspend/resume , or also for
runtime PM ? for example, is the keybaord example , which you linked,
relevant for runtime PM too ?
Refer to my reply in the other thread.
If yes
Hello,
What is usually the criterion for PM (power management) suspending
that application shall use ? Is it according to minimum threshold for
cpu load (as indication for no process) ?
How usually it is performed, i.e. is it some periodic process, which
wakes up periodically to check criterion
On Wed, Sep 10, 2014 at 8:59 PM, valdis.kletni...@vt.edu wrote:
On Wed, 10 Sep 2014 20:26:48 +0300, Ran Shalit said:
What is usually the criterion for PM (power management) suspending
that application shall use ? Is it according to minimum threshold for
cpu load (as indication for no process
On Wed, Sep 10, 2014 at 9:39 PM, valdis.kletni...@vt.edu wrote:
On Wed, 10 Sep 2014 21:23:28 +0300, Ran Shalit said:
As far as I understand, suspend/respond PM is not per device, but for
all system,
and wakeup source will resume again the whole system.
I think you mean runtime suspend
On Wed, Sep 10, 2014 at 10:25 PM, valdis.kletni...@vt.edu wrote:
On Wed, 10 Sep 2014 21:58:48 +0300, Ran Shalit said:
1. How can I make a process to notice this inactivity ? Do you think
it can be implemented by some periodic process who check if there is
activity ? It returns
On Thu, Sep 11, 2014 at 12:24 PM, Ran Shalit ransha...@gmail.com wrote:
On Thu, Sep 11, 2014 at 8:32 AM, AYAN KUMAR HALDER ayankum...@gmail.com
wrote:
On Thu, Sep 11, 2014 at 12:55 AM, valdis.kletni...@vt.edu wrote:
On Wed, 10 Sep 2014 21:58:48 +0300, Ran Shalit said:
1. How can I make
On Sun, Sep 14, 2014 at 7:45 PM, Peter Teoh htmldevelo...@gmail.com wrote:
On Sat, Sep 13, 2014 at 3:50 PM, Ran Shalit ransha...@gmail.com wrote:
On Sat, Sep 13, 2014 at 4:14 AM, Peter Teoh htmldevelo...@gmail.com
wrote:
please elaborate your requirements. char dev is for I/O to hardware
Hello,
What should be the approximate rate of entering and exit retention
mode in cpuide ?
Thanks
Ran
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Hello,
Does anybody know what is the minimum expected time for sleep period
with the cpuidle ?
I intend t use the menu governer, and I try to estimate the sleep time.
Thanks,
Ran
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Hello,
I try to understand the cpuidle main concept but have some
difficulties. I could not find any documentation to explain the
cpuidle.
what does it mean that it enters idle when no thread to run ?if I
have only one process which does only
while(1)
{
printf(C);
mdelay(1000);
}
Can I expect
Hello,
I need to implement mmap for non-volatile memory chip (NVRAM).
I already did something simple, but now I understand that it is not complete:
The nvram need to be unlock and locked after finishing the memory task
of read/write.
Does mmap can handle such post/pre actions or not ( I guess
Hello,
I've successfuly managed to work with kgdb on linux: 3.14.25
But it seems that I must close the serial connection (which uses also for stdout
print), in order for the kgdb to manage its communication ?
I can use telnet instead, but still I thought that kgdb can handle
both the kgdb
On Sat, Dec 5, 2015 at 8:03 AM, Ran Shalit <ransha...@gmail.com> wrote:
> Hello,
>
> I would like to ask what is the effect of wiping frame buffer (dd
> if=/dev/zero of=/dev/fb0) ?
> I have some issue with framebuffer timing on LCD 240x320.
> I could not find a timing wi
Hello,
I would like to ask what is the effect of wiping frame buffer (dd
if=/dev/zero of=/dev/fb0) ?
I have some issue with framebuffer timing on LCD 240x320.
I could not find a timing with width=240, height=320 which result in
stable picture, but
the following timing gave me stable ppicture with
On Fri, Feb 5, 2016 at 11:15 AM, Denis Kirjanov <kirja...@gmail.com> wrote:
> On 2/5/16, Ran Shalit <ransha...@gmail.com> wrote:
>> Hello,
>>
>> I read the readme about dma API, but still don't understand how it
>> should be used
>> It is said that dma
Hello,
I read the readme about dma API, but still don't understand how it
should be used
It is said that dma_alloc_coherent is responsible for allocating the buffer.
1. But how to trigger the dma transaction to start ?
2. Is there a callback when it is finished ?
Thank you,
Ran
On Wed, Feb 24, 2016 at 10:17 AM, <valdis.kletni...@vt.edu> wrote:
> On Wed, 24 Feb 2016 09:36:54 +0200, Ran Shalit said:
>
>> I am trying to write to rsyslog from application.
>> With openlog(..., LOG_USER), it works fine and I find the log in
>> /var/log/u
Hello,
I am trying to write to rsyslog from application.
With openlog(..., LOG_USER), it works fine and I find the log in
/var/log/user.log (it is defines in /etc/rsyslog.d/50-defaults.conf )
But we need to enable different applications to have each its own log file.
I tried to use LOG_LOCAL0
Hello,
I would like to monitor the write access to disk blocks (so that I can
monitor the block index in some bitmap)
I think this must be done in kernel (userspace have no such information)
I have tried to search in kernel but did not found where is the API to
access disk blocks.
There is
On Wed, Mar 9, 2016 at 11:16 AM, Ran Shalit <ransha...@gmail.com> wrote:
> Hello,
>
> I have some sample code which uses 2 test application:
> 1. test application in kernel , which allocates buffer using kmalloc
> (GFP_KERNEL)
> 2. test application in userspace which alloc
Hello,
I have some sample code which uses 2 test application:
1. test application in kernel , which allocates buffer using kmalloc
(GFP_KERNEL)
2. test application in userspace which allocates buffer using malloc
In both cases the buffers are DMA through PCI.
I don't understand how is it that
Hello,
I write a network driver, and I try to understand how to communicate with phy.
I see several methods, but did not found documentation on the
differences, and when to use each of these methods:
1. using generic phy -
a. I think we use it when we don't know the exaxt phy (?), though
I'm
Hello,
I write ethernet driver (mac controller is implemented in fpga connected to cpu)
I see that the probe is not called on doing insmod.
Is there a way to force the probe to be called on doing insmod ?
I could not find in the board file (omap dart, kernel 3.4.0) any
reference to ethernet.
On Fri, Jul 29, 2016 at 10:03 PM, Greg KH <g...@kroah.com> wrote:
> On Fri, Jul 29, 2016 at 09:47:40PM +0300, Ran Shalit wrote:
>> Hello,
>>
>> Can we write Ethernet driver without using dma ?
>
> Sure, we have USB network drivers that don't use DMA.
>
>&
Hello,
I am writing ethernet network driver.
I would like to ask if there are any steps which can help when
debugging ethernet driver, or is it that the first test should already
involve transmit/recieve packets to/from ip stack ?
Any tips for debugging and testing a new ethernet driver will be
Hello,
Can we write Ethernet driver without using dma ?
But still using sk_buff APIs like done in most drivers ?
Thanks,
Ran
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Hello,
As I understand word length in spi, defines the cs active time.
It therefore seems that linux driver suits when dealing with simple spi
protocols which keeps word size constant.
How can we deal with spi protocols which use different spi size as part of
protocol.
for example cs need to be
Hello,
I am trying to correctly register interrupt in kernel for user interface:
irq handler
=
static irqreturn_t irq_handler(int irq, void *dev_id)
{
struct elbit_irq_dev *elbit_irq = _irq_devices[0];
printk("irq in\n");
<< clear interrupt in fpga here or after the call
Hello,
Is it possible to display in some way the current content of frame buffer ?
I have some issue that on rendering to /dev/fb2 with one application
(psplash), it goes to the correct output, but using another
application (qt) it always goes to /dev/fb2 (even if I static link
/dev/fb0 to
Hello,
I am not sure I understand the difference between dma mam<>mem to mem<>device.
I am writing ethernet driver which use dma between ipstack buffer to
fpga buffer (the fpga implements in hw the the ethernet mac).
When moving buffers from one address (ipstack) to another (fpga) isn;t
it just
Hello,
I have fpga connected to cpu.
In fpga we implement fifo which the cpu need to write into or read from.
The fpga is used for mac implementation.
So we actually need to copy to/from ip stack buffer to the fifo buffers in fpga.
As far as I understand this is memory-to-memory dma.
But I am
Hello,
There is something I don't understand about dma,
when doing memory to memory dma, it requires to cllocate dma buffer
(for example with dma_alloc_coherent),
than for each transfer we need to copy the buffer to the allocated
memory and than trigger dma transaction.
So, if it requires
On Thu, Sep 15, 2016 at 11:50 PM, <valdis.kletni...@vt.edu> wrote:
> On Thu, 15 Sep 2016 23:19:51 +0300, Ran Shalit said:
>
>> Isn't writing to console, the same as outputing chars to serial ?
>
> No. For instance, consider any laptop where "console" is a
Hello,
I am writing a driver with serial tx/rx.
I am not sure what is the need console routines, when there is
serial/uart tx/rx.
Isn't writing to console, the same as outputing chars to serial ?
I've tried to find information on this, but found none.
Thank you,
Ran
On Wed, Dec 7, 2016 at 7:26 PM, Ran Shalit <ransha...@gmail.com> wrote:
> On Wed, Dec 7, 2016 at 6:58 PM, Joel Fernandes <agnel.j...@gmail.com> wrote:
>> On Tue, Dec 6, 2016 at 11:02 PM, Greg KH <g...@kroah.com> wrote:
>>> On Tue, Dec 06, 2016 at 09:12:24PM -080
On Wed, Dec 7, 2016 at 6:58 PM, Joel Fernandes <agnel.j...@gmail.com> wrote:
> On Tue, Dec 6, 2016 at 11:02 PM, Greg KH <g...@kroah.com> wrote:
>> On Tue, Dec 06, 2016 at 09:12:24PM -0800, Joel Fernandes wrote:
>>> On Tue, Dec 6, 2016 at 11:42 AM, Ran Shal
On Wed, Dec 7, 2016 at 8:21 PM, Ran Shalit <ransha...@gmail.com> wrote:
> On Wed, Dec 7, 2016 at 7:26 PM, Ran Shalit <ransha...@gmail.com> wrote:
>> On Wed, Dec 7, 2016 at 6:58 PM, Joel Fernandes <agnel.j...@gmail.com> wrote:
>>> On Tue, Dec 6, 2016 at 11:0
On Wed, Dec 7, 2016 at 9:02 AM, Greg KH <g...@kroah.com> wrote:
> On Tue, Dec 06, 2016 at 09:12:24PM -0800, Joel Fernandes wrote:
>> On Tue, Dec 6, 2016 at 11:42 AM, Ran Shalit <ransha...@gmail.com> wrote:
>> > Hello,
>> >
>> > I have spi device w
Hello,
I have spi device which is registered using spi_register_board_info(),
and I would like to get a pointer to this device in some other kernel module.
Is there a simple way to get a pointer to pointer to a device , so
that we can use it from other module ? (something like i2c_get_adapter
Hello,
I've seen some modules where it is tested if virtual address is 0, and
if yes, it is acted as if it is an error.
But can't virtual address be zero too ?
For example, in the following module:
https://github.com/khilman/omap-test-dmatest/blob/master/main.c
it is checked the returned value
On Sat, Dec 3, 2016 at 3:15 PM, Greg KH <g...@kroah.com> wrote:
> On Sat, Dec 03, 2016 at 02:43:30PM +0200, Ran Shalit wrote:
> > Hello,
> >
> > Is there some way to disable input event device ?
> > Maybe a way to disable its irq usage ?
> >
> > I
On Sat, Dec 3, 2016 at 8:58 PM, Daniel. <danielhi...@gmail.com> wrote:
> Is xinput avaible? I know that it can be use to disable input devices,
> but IFAIK android use custom GUI, that is not X...
>
>
>
No, it's not available in Android.
> 2016-12-03 16:04 GMT-
On Sat, Dec 3, 2016 at 7:59 PM, Ran Shalit <ransha...@gmail.com> wrote:
>
>
> On Sat, Dec 3, 2016 at 7:48 PM, Daniel. <danielhi...@gmail.com> wrote:
>
>> Is blacklisting it an option??
>>
>>
> I think not, because blacklist is only for loaded mod
Hello,
Is there some way to disable input event device ?
Maybe a way to disable its irq usage ?
I actually rather do that from shell, not from kernel, because the kernel
source is not available, and I thought that issue is also relevant in the
forum.
Thank you,
Ranchu
On Mon, Dec 5, 2016 at 10:24 AM, Umair Khan <omerj...@gmail.com> wrote:
> On Mon, Dec 5, 2016 at 12:56 PM, Ran Shalit <ransha...@gmail.com> wrote:
> > Hello,
> >
> > I am trying to turn off screen using sysfs entries,
> > but I'm having some difficulties wi
Hello,
We need to support serial driver with real time requirements (towards
specific device with RT demands):
Every 5.3msec receive 100 bytes and 1.3msec afterwards send 100 bytes.
1. Does kernel support real-time of such hard requirements ?
2. Is it matter if we do the exact bytes send/receive
On Mon, Dec 5, 2016 at 4:35 PM, Greg KH <g...@kroah.com> wrote:
> On Mon, Dec 05, 2016 at 04:24:05PM +0200, Ran Shalit wrote:
> > Hello,
> >
> > We need to support serial driver with real time requirements (towards
> specific
> > device with RT demands):
On Sun, Dec 25, 2016 at 2:37 PM, Greg KH <g...@kroah.com> wrote:
> On Sat, Dec 24, 2016 at 05:47:19PM +0200, Ran Shalit wrote:
>>
>>
>> On Tue, Dec 20, 2016 at 12:26 PM, Greg KH <g...@kroah.com> wrote:
>>
>> On Tue, Dec 20, 2016 at 12:15:22PM +0200
Hello,
I read the DMA-API-HOWTO
https://www.kernel.org/doc/Documentation/DMA-API-HOWTO.txt
Which mainly talks about dma mapping APIs.
But I don't understand what's the meaning of DMA direction in context
of mapping.
As I understand this documentation talks about mapping of dma buffers
- NOT
Hello,
I am trying to understand if kernel thread are always higher priority
then user thread.
Say, a kernel thread (created with kthread_create with SCHED_FIFO and
given priority x), and user thread (created with pthread_create was
created with SCHED_FIFO and given priority y), and priority of
Hello,
I want to use DMA from userspace.
I already use dma in kernel, and now I want can create a character
device which will be responsible for this.
The only problem is that I want to use the same memory which was
allocated in kernel with dma_alloc_coherent.
Is it correct to use mmap in
Hello,
This is something I'm not too sure about, so I rather ask it here:
When the context return to userspace on calling poll, is it done in
interrupt context ?
...
ret = poll(fds, 2, TIMEOUT * 1000);
if (ret == -1) {
perror ("poll");
return 1;
}
if (!ret) {
return 0;
}
if (fds[0].revents &
On Tue, Dec 20, 2016 at 11:38 AM, Greg KH <g...@kroah.com> wrote:
> On Mon, Dec 19, 2016 at 06:08:47PM +0200, Ran Shalit wrote:
>> Hello,
>>
>> I want to use DMA from userspace.
>
> Why?
Hi Greg,
We want that a userspace layer (a library) will do some HW relate
On Tue, Dec 20, 2016 at 12:26 PM, Greg KH <g...@kroah.com> wrote:
> On Tue, Dec 20, 2016 at 12:15:22PM +0200, Ran Shalit wrote:
> > On Tue, Dec 20, 2016 at 11:38 AM, Greg KH <g...@kroah.com> wrote:
> > > On Mon, Dec 19, 2016 at 06:08:47PM +0200, Ran Shalit wrote:
On Sun, Dec 4, 2016 at 12:33 PM, Greg KH <g...@kroah.com> wrote:
> On Sat, Dec 03, 2016 at 07:18:50PM +0200, Ran Shalit wrote:
>>
>>
>> On Sat, Dec 3, 2016 at 3:15 PM, Greg KH <g...@kroah.com> wrote:
>>
>> On Sat, Dec 03, 2016 at 02:43
Hello,
I find in documentation mention of rapidIO:
https://www.kernel.org/doc/Documentation/rapidio/rapidio.txt
Yet, in source code it seems that only few devices are supported with rapidIO:
http://lxr.free-electrons.com/source/drivers/rapidio/
Hello,
I don't find in uio_pci_generic.c any usage of DMA.
Is it that the driver does not use DMA in transactions between device and host ?
Regards,
Ran
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Hello,
In PCI documentation
https://www.mjmwired.net/kernel/Documentation/PCI/pci.txt
there is a lot of reference to "DMA".
Is it DMA on cpu side or device side ?
Best Regards,
Ran
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Hello,
On viewing PCI driver, I see that dma buffer are allocated even while
the dma engine is actually in the EP device.
Is there any sense in doing this ?
Thanks,
Ran
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