As M4 is sourcing UART clk from OSC, to make UART work when M4 is enabled, need to select OSC as clk parent, 24M OSC is enough for debug UART in uboot.
Signed-off-by: Peng Fan <[email protected]> Cc: Stefano Babic <[email protected]> Cc: Fabio Estevam <[email protected]> --- arch/arm/mach-imx/mx6/soc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/mach-imx/mx6/soc.c b/arch/arm/mach-imx/mx6/soc.c index e2ecc3a..b4ec11a 100644 --- a/arch/arm/mach-imx/mx6/soc.c +++ b/arch/arm/mach-imx/mx6/soc.c @@ -364,6 +364,7 @@ int arch_cpu_init(void) { struct sched_ctrl_regs *regs = (struct sched_ctrl_regs *)MF2_SCHED_BASE_ADDR; + struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR; init_aips(); @@ -434,6 +435,9 @@ int arch_cpu_init(void) imx_set_wdog_powerdown(false); /* Disable PDE bit of WMCR register */ + if (is_mx6sx()) + setbits_le32(&ccm->cscdr1, MXC_CCM_CSCDR1_UART_CLK_SEL); + /* * To resolve USB camera bandwidth issue, the patch sets * recommended AQoS setting from IC team value for peripheral -- 2.6.2 _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
