[PATCH 8/9] add-gta03-pmu-533MHz-init.patch

Andy Green andy at openmoko.com
Wed Aug 20 16:26:30 CEST 2008

Hash: SHA1

Somebody in the thread at some point said:
| Andy Green wrote:
|> What we might choose to do in Qi though is override the default 500mA
|> USB current limit set by PMU "ROM" to 100mA
| Yup, keeping 500mA enabled for a long time is evil.
|> and then we definitely set
|> in stone that we disallow boot without a battery in
| Are you sure about that ? With SDRAM up and running and the CPU
| busy-looping at 200MHz, we should still only draw about 70mA
| from USB.

My ammeter shows ~120mA average during Linux boot from USB, this is at
400MHz though (with backlight down).

This does matter because now we won't enable charging until we get into
Linux, if the battery is stone cold dead we really need to be able to
get as far as pcf50633 init and USB enumeration so we can come back from
the dead on GTA03 (regardless of VB_SYS situation).

Anyway it's not Qi issue for today but it is shaping up clearly as
kernel issue for "tomorrow", I wonder if it means we should examine
Cesar's cpufreq stuff carefully as it can be a big part of the answer.

- -Andy
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