On 2021-11-12 12:19, Rob Kossler wrote:
Yes, I had included the "hwclock" output in the original email of this
chain. It can't find a hw clock.
Ah, sorry. I missed that.
So, for whatever reason, the DS-1307 driver has been excluded from the
kernel image, OR there's a hardware problem--check dmesg to see if it
makes any comments about the ds-1307 driver being loaded, etc.
But as I indicated, I don't think the DS-1339 RTC chip has a back-up
battery of any kind. So, there may have been a conscious decision to remove
the driver for it. I'm still waiting to hear from R&D.
On Fri, Nov 12, 2021 at 12:17 PM Marcus D. Leech
<patchvonbr...@gmail.com> wrote:
On 2021-11-12 11:54, Rob Kossler wrote:
So, there's a DS1139 RTC chip, which is an garden-variety RTC
chip used in designs all over the place. The linux rtc-1307
kernel driver knows about this chip.
HOWEVER, it requires a battery to maintain time, and near as
I can tell, the only battery in the E310 universe is with the
E312 "UPS" battery. I don't see any evidence
that there's a separate, small, back-up battery for the RTC
in the plain E310.
I wonder how my system comes up Aug 6, 2021? Could this be the
date of the file system image? Perhaps I can modify this.
It was certainly the case in the "days of yore" that the timestamp
on the root filesystem, in lieu of other inputs, was used as the
initial time-of-day clock setting.
Also, look at the "hwclock" utility, if there IS a hardware clock
in your system config, it will allow you to manipulate it.
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