HBIRD_MEM_CNTL0_ADDR
mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
unsigned long mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
(void) read_hbreg(HBIRD_MEM_CNTL0_ADDR);
mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);