lkml.org 
[lkml]   [2012]   [Jan]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] drivers, char: add U-Boot bootcount driver
Hello Rob,

Sorry for the late reply ...

Rob Herring wrote:
> On 12/06/2011 04:06 PM, Wolfram Sang wrote:
>>>> bootcount itself is not a device. It is a feature of certain devices. And that
>>>> needs to be implemented; possibly generic enough that it can work for register
>>>> based, i2c based, and so forth, accesses.
>>> If "boot counter" is not a good name for such a device, then what name
>>> would you suggest?
>> None.
>>
>>> Or do you think a counter (which can be implemented in a number of
>>> different ways, depending on hardware specifics) is not a device?
>> Yes.
>>
>>> What would be such a device, then?
>> "maxim,ds1338"
>>
>> Please have a look at the devicetree.org-wiki-page I just mentioned:
>>
>> http://devicetree.org/Device_Tree_Usage
>>
>
> Perhaps fs/pstore would be a good choice for the user space interface
> (defining a new file bootcount). This can support any arbitrary backing
> device although pretty much only ACPI is implemented.

I tried to use fs/pstore for the bootcount feature, and I can mount
and read the bootcount value from the file, I created. But I could not
write to that file ... I only see the callback from
include/linux/pstore.h

struct pstore_info {
[...]
int (*write)(enum pstore_type_id type,
enum kmsg_dump_reason reason, u64 *id,
unsigned int part, size_t size, struct pstore_info *psi);

called, if I reboot ... do I miss something? Or is it not possible
to write to the files created through fs/pstore?

bye,
Heiko
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany


\
 
 \ /
  Last update: 2012-01-30 13:45    [W:0.036 / U:0.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site