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Motorola WR850G V2 mmc sd mod
PIN GPIO Router solder point
1 GPIO7 WAN LED(RED)
2 GPIO2 empty pad below RC117 (bottom solder pad)
3 VSS (GND)
4 VDD (3.3V)
5 GPIO3 (!) emty pad below RC117 (top solder pad) <------- here I have a concern with this GPIO
6 VSS2 (GND)
7 GPIO4 RR153 (top pad)
look at the pads when router looks LEDS at you and LAN ports are at the top.
Since it was reported that GPIO3 always stays at 01 in Morotola WRE850G I decided to make an experiment. I run terminal window and triggered gpio from 0 to 1 and multimeter did not go back to 1 automatically. It only went back to 1 when I do GPIO poll 3 . Why ?
I have heard that person named frop already done sd mod using :
SD_DI -> GPIO 1, SD_DO -> GPIO 5, SD_CLK -> GPIO 6, SD_CS -> GPIO 0 .
Did anyone tried to play with WR850G V2 SD mod ? Can anyone share mmc.o and GPIO lines working for the Motorola. That would be very interesting project.
Please update wiki with a confirmed working SD MMC mod.
DI: GPIO2
DO: GPIO3
CLK:GPIO4
CS: GPIO7
The mod requires GPIO layout changes is mmc.c and recompiling the driver. I have not experimented with high speed mmc driver.
The unut is stable with the mod done. GPIO3 play some role in ADMTEK switch functions and resets back to 1 all the time, it does not impact I/O of SD to function properly except if you require to boot from SD card. |
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