Hi Tom,
I can confirm the same effect my side. I also checked using the katcp
command
?wordwrite sys_scratchpad 0 0xffffffff
And this doesn't effect the filesize, however all the registers are open
file descriptors after the ?progdev.
strace'ing the echo -ne command seems to show a mmap of 4k then a write
then a close and an munmap
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x3001a000
write(1, "\377\0\377\0", 4) = 4
close(1)
= 0
munmap(0x3001a000, 4096) = 0
while strace'ing tcpborphserver2 shows a seek then a write.
read(9, "?wordwrite sys_scratchpad 0 0xff"..., 512) = 39
lseek(35, 0, SEEK_SET) = 0
write(35, "\377\377\377\22", 4) = 4
I suspect it has something to do with the inode for the register file not
being refreshed ??? i dug into linux/borph.c but can't seem to see anything
yet.
I will look into it more.
Regards
Adam
On Tue, Aug 28, 2012 at 10:06 PM, Tom Kuiper <[email protected]> wrote:
> **
> On 08/28/2012 10:53 AM, Adam Barta wrote:
>
> I think the quotes are important too " "
>
> There's still something funny going on. Look at the file size for
> sys_scratchpad after writing.
>
> Tom
>
> root@roach1:/proc/1221/hw/ioreg# ls -l
> total 0
> -r--r--r-- 1 root root 4 Jul 28 02:13 acc_cnt
> ...
> -rw-rw-rw- 1 root root 4 Jul 28 02:13 sys_scratchpad
> -rw-rw-rw- 1 root root 4 Jul 28 02:13 trig_adc0
> root@roach1:/proc/1221/hw/ioreg# echo -en "\xFF\xFF\xFF\xFF" >
> sys_scratchpad
> root@roach1:/proc/1221/hw/ioreg# cat sys_scratchpad | hd
>
> 00000000 ff ff ff ff |....|
> 00000004
> root@roach1:/proc/1221/hw/ioreg# ls -l
> total 0
> -r--r--r-- 1 root root 4 Jul 28 02:13 acc_cnt
> ...
> -rw-rw-rw- 1 root root 0 Jul 28 02:21 sys_scratchpad
> -rw-rw-rw- 1 root root 4 Jul 28 02:13 trig_adc0
>
>
>
> On Tue, Aug 28, 2012 at 7:48 PM, Tom Kuiper <[email protected]> wrote:
>
>> On 08/28/2012 10:45 AM, Adam Barta wrote:
>>
>> Yes its the trailing newline i think so
>>
>> echo -en "\xFF"
>>
>> would work
>>
>> Yes, thanks for the -n tip. Here's what I get.
>>
>> root@roach1:/proc/1174/hw/ioreg# echo -en \x01\x00 > trig_adc0
>>
>> root@roach1:/proc/1174/hw/ioreg# cat trig_adc0 | hd
>> 00000000 78 30 31 78 |x01x|
>> 00000004
>> root@roach1:/proc/1174/hw/ioreg# echo -en \xff\xff > trig_adc0
>>
>> root@roach1:/proc/1174/hw/ioreg# cat trig_adc0 | hd
>> 00000000 78 66 66 78 |xffx|
>> 00000004
>> root@roach1:/proc/1174/hw/ioreg# echo -en \xFF\xFF > trig_adc0
>>
>> root@roach1:/proc/1174/hw/ioreg# cat trig_adc0 | hd
>> 00000000 78 46 46 78 |xFFx|
>> 00000004
>>
>> Since this is on a ROACH-1 PPC we should be running the same OS, so I'm
>> puzzled.
>>
>> Tom
>>
>>
>
>
> --
> *Adam Barta*
> c: +27 72 105 8611
> e: [email protected]
> w: www.ska.ac.za
>
>
>
>
> --
> I or me? http://www.oxforddictionaries.com/page/145
>
>
--
*Adam Barta*
c: +27 72 105 8611
e: [email protected]
w: www.ska.ac.za
