CODA9_REG_JPEG_BBC_WR_PTR
coda_write(dev, start_addr + header_len, CODA9_REG_JPEG_BBC_WR_PTR);
wr_ptr = coda_read(dev, CODA9_REG_JPEG_BBC_WR_PTR);
wr_ptr = coda_read(dev, CODA9_REG_JPEG_BBC_WR_PTR);
coda_write(dev, end_addr, CODA9_REG_JPEG_BBC_WR_PTR);