[EMAIL PROTECTED] wrote:
Thanks for the quick reply. But I was wondering as to why I would have to map
the physical address to the virtual address when I know that the string is
permanently in the physical memory because its loaded into flash.
Because that is how any CPU with a MMU works.
All a
Manu Abraham schrieb:
On 7/11/07, Nobin Mathew <[EMAIL PROTECTED]> wrote:
See this in the documentation
The returned virtual address is a current CPU mapping for the memory
address given. It is only valid to use this function on addresses that
have a kernel mapping
This function does not handl
Thanks
On 7/11/07, Manu Abraham <[EMAIL PROTECTED]> wrote:
On 7/11/07, Nobin Mathew <[EMAIL PROTECTED]> wrote:
> See this in the documentation
>
> The returned virtual address is a current CPU mapping for the memory
> address given. It is only valid to use this function on addresses that
> have
On 7/11/07, Nobin Mathew <[EMAIL PROTECTED]> wrote:
See this in the documentation
The returned virtual address is a current CPU mapping for the memory
address given. It is only valid to use this function on addresses that
have a kernel mapping
This function does not handle bus mappings for DMA
On 7/11/07, Nobin Mathew <[EMAIL PROTECTED]> wrote:
Which is your platform ?
Which processor?
If you want to use physical address directly, then disable MMU. That
is not possible in linux.
ioremap does map io memory using phys_to_virt
I thought phys_to_virt was enough to remap physical memory
See this in the documentation
The returned virtual address is a current CPU mapping for the memory
address given. It is only valid to use this function on addresses that
have a kernel mapping
This function does not handle bus mappings for DMA transfers. In
almost all conceivable cases a device d
Which is your platform ?
Which processor?
If you want to use physical address directly, then disable MMU. That
is not possible in linux.
Nobin
On 7/11/07, Manu Abraham <[EMAIL PROTECTED]> wrote:
On 7/10/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> Thanks for the quick reply. But I was
On 7/10/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Thanks for the quick reply. But I was wondering as to why I would have to map
the physical address to the virtual address when I know that the string is
permanently in the physical memory because its loaded into flash. Is there a way
to di
Thanks for the quick reply. But I was wondering as to why I would have to map
the physical address to the virtual address when I know that the string is
permanently in the physical memory because its loaded into flash. Is there a way
to directly read from the physical memory location? Also, do the
Hi,
If you know the physical address, then you get virtual address
from that physical adress by using ioremap().
Then you can use readl(virtualaddress) to read the string from there
Nobin Mathew
On 7/10/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
--
Hey all,
I know the physical
--
Hey all,
I know the physical address of a string which is loaded into flash memory. I
want to read the string at the known physical memory location from within a
kernel module. I initially tried reading the "/dev/mem" file using open(),
lseek() and read(). But I guess its not possible to call
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