u-boot fix to charge empty battery
andy at openmoko.com
Thu Oct 9 16:31:13 CEST 2008
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Philipp Hug wrote:
> the problem here is, that even 500mA is not enough to boot. at least
> that's what I experienced.
> but maybe this was also only related to vsys going below it's threshold
> and initiating shutdown timer.
500mA should be fine to boot, the thing is typ 200-300mA at VB when
"busy" depending on what's going on. If the GSM thing starts
transmitting though, that can easily pull >2A instantaneously.
We found strange crashes many months ago in U-Boot around enabling the
charger, it seems it can be the lowvsys thing going on maybe. We never
figured it out and A6 acts different / better IIRC, presumably due to
size of the cap on VB_SYS.
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