[U-Boot] [PATCH v2][repost] arm: Kirkwood: add SYSRSTn Duration Counter Support

[Prafulla Wadaskar]

> -----Original Message-----
> From: Jean-Christophe PLAGNIOL-VILLARD [mailto:plagnioj at jcrosoft.com] 
> Sent: Thursday, August 20, 2009 4:00 AM
> To: Prafulla Wadaskar
> Cc: u-boot at lists.denx.de; Ashish Karkare; Prabhanjan Sarnaik; 
> Ronen Shitrit
> Subject: Re: [U-Boot] [PATCH v2][repost] arm: Kirkwood: add 
> SYSRSTn Duration Counter Support
> 
> On 16:24 Wed 19 Aug     , Prafulla Wadaskar wrote:
> > I am sorry for previous post v2, pls ignore it, this is the 
> right patch for the same
> > 
> > This feature can be used to trigger special command 
> "sysrstcmd" using
> > reset key long press event and environment variable 
> "sysrstdelay" is set
> > (useful for reset to factory or manufacturing mode execution)
> > 
> > Kirkwood SoC implements a hardware-based SYSRSTn duration counter.
> > When SYSRSTn is asserted low, a SYSRSTn duration counter is running.
> > The counter value is stored in the SYSRSTn Length Counter Register
> > The counter is based on the 25-MHz reference clock (40ns)
> > It is a 29-bit counter, yielding a maximum counting duration of
> > 2^29/25 MHz (21.4 seconds). When the counter reach its 
> maximum value,
> > it remains at this value until counter reset is triggered by setting
> > bit 31 of KW_REG_SYSRST_CNT
> > 
> > Implementation:
> > Upon long reset assertion (> ${sysrstdleay} in secs) 
> sysrstcmd will be
> > executed if pre-defined in environment variables.
> > This feature will be disabled if "sysrstdelay" variable is unset.
> > 
> > for-ex.
> > setenv sysrst_cmd "echo starting factory reset;
> > 		   nand erase 0xa0000 0x20000;
> > 		   echo finish ed sysrst command;"
> > will erase particular nand sector if triggered by this event
> > 
> > Signed-off-by: Prafulla Wadaskar <prafulla at marvell.com>
> > ---
> > Change log:
> > v2: updated as per review feedback for v1
> > bug fix in the previous post (V2) fixed
> ok
> 
> but I think make optionnal will be better
Hi Jean
Thanks..
I didn't understod what you want to say here, can you pls explain?

Regards..
Prafulla . .

> 
> Best Regards,
> J.
>