> -----Original Message----- > From: Jean-Christophe PLAGNIOL-VILLARD [mailto:[email protected]] > Sent: Thursday, August 20, 2009 4:00 AM > To: Prafulla Wadaskar > Cc: [email protected]; 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 <[email protected]> > > --- > > 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. > _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
