is that a bug of sdk1.0.1_b2?

[grantgao]

my project based on sdk1.0.1_b1 and os_printf function work good, when i changed to sdk1.0.1_b2,os_printf work abnormal,it can not printf long strings and printf many chars not expected,i have compared the newest /driver/uart.c and old one,these two file have many differences .i'v no idea is that a bug what i described.