Openmoko Bug #2310: charging N900 with gta02 causes the gta02 to overheat

[Openmoko Public Trac]

#2310: charging N900 with gta02 causes the gta02 to overheat
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 Reporter:  lindi            |          Owner:  openmoko-kernel     
     Type:  defect           |         Status:  new                 
 Priority:  normal           |      Milestone:                      
Component:  System Software  |        Version:  unspecified         
 Severity:  normal           |       Keywords:  battery pmu charging
 Haspatch:  0                |      Blockedby:                      
Estimated:                   |    Patchreview:                      
 Blocking:                   |   Reproducible:                      
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 Steps to reproduce:
 1) modprobe ochi-hcd
 2) echo host > /sys/devices/platform/s3c-ohci/usb_mode
 3) echo 1 > /sys/class/i2c-adapter/i2c-0/0-0073/neo1973-pm-host.0/hostmode
 4) connect nokia N900 and openmoko with usb cable

 Expected results:
 4) N900 charges from openmoko

 Actual results:
 4) N900 charges from openmoko. However, the openmoko heats considerably up
 and you notice the smell of burning components. The current_now sysfs node
 shows a current of 2000 mA.

 More info:
 1)

 Qi 9ef7754b8243457c
 linux andy-tracking 9ecc089861ab238e
 kernel cmdline: loglevel=4 console=tty0 console=ttySAC2,115200
 init=/sbin/init ro  mtdparts=physmap-
 flash:-(nor);neo1973-nand:0x00040000(qi),0x00040000(depr-ub-
 env),0x00800000(kernel),0x000a0000(depr),0x00040000(identity-
 ext2),0x0f6a0000(rootfs)  g_ether.host_addr=00:1F:11:01:1F:6B
 g_ether.dev_addr=00:1F:11:01:1F:6B  root=/dev/mmcblk0p1 rootdelay=1
 rootdelay=1 panic=20 mem=127M root=/dev/mmcblk0p2 loglevel=8
 distro: debian gnu/linux unstable
 hardware revision:  24420350
 gta02v5 with buzz fix

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Ticket URL: <https://docs.openmoko.org/trac/ticket/2310>
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