Here I want to share a block of physical memory between two different cpus.
I want to simple use original real mode memory address.
Is there a simple way to invalid linux memory cache after writing to and
before reading from it?
ex. invalid_cache_range(u32 phy_address, u32 length).
My cpu is
Hello all,
Where could I get the source code of Atmel 641t touchscreen driver?
I searched, no spec document and linux driver source for downloading.
Regards,
kipade
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cortex A15, omap5 platform
在 2017年07月06日 17:30, Kamil Konieczny wrote:
>
> On 06.07.2017 11:04, kipade wrote:
>> I use arm 32bit cpu, with kernel 3.14
> banana-pi ? nano-pi ? orange-pi ? odroid ?
>
> Is it memory region for system registers ?
>
>>> On 06.07.2017
In fact, I want to allocate a continous of pages from a given physical
address for a shm object in
shmem_file_setup, might i should write a customized shmem_file_setup2
for this?
在 2017年07月06日 17:30, Kamil Konieczny wrote:
>
> On 06.07.2017 11:04, kipade wrote:
>> I use a
, Kamil Konieczny wrote:
On 06.07.2017 11:43, kipade wrote:
In fact, I want to allocate a continous of pages from a given physical
address for a shm object in
shmem_file_setup, might i should write a customized shmem_file_setup2
for this?
I use arm 32bit cpu, with kernel 3.14
why do want
I use arm 32bit cpu, with kernel 3.14
在 2017年07月06日 16:53, Kamil Konieczny wrote:
>
> On 06.07.2017 05:08, kipade wrote:
>> Here I want to allocate a block of shared memory from a given physical
>> address, such as 0x9000, 6M. However, alloc_pages can't fit this
>> poi
Might be? I have no puzzle of CMem。 OK, I will continue go search solutions for
that.
And, if I got it, I will come back for sharing solutions here.
And, thank you, all
At 2017-07-06 19:17:45, "Kamil Konieczny" <k.koniec...@partner.samsung.com>
wrote:
>
>
>On 06.07
Here I want to allocate a block of shared memory from a given physical
address, such as 0x9000, 6M. However, alloc_pages can't fit this
point. I had reserved enugh pages via cmem, there also have enough
continous pages for such allocation anywhere else. What should I do?
y can read it. Any hints?
在 2017/8/18 下午9:32, Amit Kumar 写道:
On Fri, Aug 18, 2017 at 12:49 PM kipade <kip...@163.com
<mailto:kip...@163.com>> wrote:
Thanks for your reply.
The code following the link almost the same as the official kernel
source.
what a pity this is not t
, 2017 at 2:25 PM Amit Kumar wrote:
Hi,
On Thu, Aug 17, 2017 at 2:33 PM kipade <kip...@163.com
<mailto:kip...@163.com>> wrote:
Hello all,
Where could I get the source code of Atmel 641t touchscreen driver?
I searched, no spec document and linux driver source for downloa
I think the linux OS can access all ram devices connected to the SOC
where linux running on.
For the ram bank owned by FPGA, the linux OS will reserve it from random
allocating in
kernel and user spaces, however, it still can access the reserved memory
via map operation
if needed.
在 2017/8/19
I found some memory was rewrite by gpu module, but i have not found where it
layout.
I just use samples hw_breakpoint module for memory monitor.
However, i found it only monitor on a virtual address,
in another words, if two variable point the same physical memory, it can't be
detected
if I just
, the block of
memory was rewrittenif the application called eglSwapBuffer. and the gpu driver
using gem memorymanaging method, i checked all pages allocated for ever
gem_object but foundnothing.
At 2017-11-17 23:03:32, valdis.kletni...@vt.edu wrote:
>On Fri, 17 Nov 2017 17:57:26 +0800, kipade s
Hi all,
I want to know the details of device(not physical ram device) registers via
mapped memory on /dev/mem.
For example, a Soc CPU has some internal device register resources, the driver
will map the memory
block to a virtual memory to kernel. But, the user application can use /dev/mem
to
, the device would not be configured correctly.
so, how to make it usable?
Regards,
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, you can make your own Target like
early.target and load modules without udev.
But you need to load modules without device tree, I guess that's not
possible.
your system is booting without device tree?
Thanks,
Akash
On Wed, Jun 20, 2018, 14:03 kipade <mailto:kip...@163.com>&
If so, I think that's the perfect resolution for that.
and, what should I do next for that way?
On 2018年06月20日 20:31, Greg KH wrote:
On Wed, Jun 20, 2018 at 04:30:40PM +0800, kipade wrote:
That's a usb host driver. As I know, the whole usb subsystem
initialization would take up to 2 seconds
06月20日 16:01, Greg KH wrote:
On Wed, Jun 20, 2018 at 02:36:52PM +0800, kipade wrote:
Now, most of kernel device are initialized by its driver according by
what described within device tree block. Here, the dtb was parsed
and used during kernel booting. If so, I want to load a device driver
after
Hi, all
As my question, would kernel destroy deivces struct if there were no matched
driver attached on it? If so, what's a suite time to drop them, and where?
Thanks.
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, Greg KH wrote:
On Wed, Jun 27, 2018 at 01:52:55PM +0800, kipade wrote:
Hi, all
As my question, would kernel destroy deivces struct if there were no matched
driver attached on it?
No, only when the device is removed from the system does that structure
get destroyed.
greg k-h
Hello all,
I created a filter driver for the vfs, for some special file read, I want to
replace its
data got from the disk and return to the new data to user space, eg. decryption.
my hooked read entry like this:
int my_hooked_read(struct file* filp, char* buffer, size_t count, loff_t* pos)
{
, Greg KH wrote:
On Thu, Apr 02, 2020 at 05:38:31PM +0800, kipade wrote:
As the topic, I want to specify a fixed physical memory space to a shared
memory object, which can use
shm_XXX api to access the memory. Of course I do not want to use mmap api to
map /dev/mem device
memory into user program
As the topic, I want to specify a fixed physical memory space to a shared
memory object, which can use
shm_XXX api to access the memory. Of course I do not want to use mmap api to
map /dev/mem device
memory into user program.
Thanks all.
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Hello, Im puzzled about the influence about iowait. Almost all the document
say, the iowait "Show the percentage of time that the CPU or CPUs were idle
during which the system had an outstanding disk I/O request."
And, if there was a programs writing disk frequently, the system's iowait would
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