Hi Peng, On Tue, Nov 15, 2022 at 6:17 AM Peng Fan <peng.fan at oss.nxp.com> wrote: > > No, the SPL not use DM_SERIAL. For mx6sabresd, it supports 3 boards, > limited SRAM made is hard to enable the DM feature. setup_iomux_uart() is not called in SPL. It is called inside U-Boot proper.