i2c controller timed out after ./load_c6xdsp.sh

Dear Experts,

Env: dm8148/dvrrdk 3.5/custom board

I use a rtc on i2c-2,
when kernel boot up, I can read date/time from RTC by "busybox hwclock":
Tue Jan  1 00:42:38 2013  0.000000 seconds

But after I execute ./init.sh ./load.sh in /opt/dvr_rdk/ti814x,
"busybox hwclock" can't not work anymore, console msg:
---
omap_i2c omap_i2c.2: controller timed out
omap_i2c omap_i2c.2: controller timed out
omap_i2c omap_i2c.2: controller timed out
omap_i2c omap_i2c.2: controller timed out
rtc-s35390a 2-0030: s35390a_freq_irq_enable: failed to read STS2 reg
---

I found this error will occure after ./load_c6xdsp.sh ~
(../bin/fw_load.out startup DSP ../firmware/dvr_rdk_fw_c6xdsp_${ENV_DDR_MEM}_${ENV_LINUX_MEM}.xe674)

Anyone can tell me how to resolve this issue ?

thx ~

HB