If the LCD controller is on before the CPU goes into reset, the traffic on LCDIF data pins interferes with the BootROM's boot mode sampling. So shut the controller down.
Signed-off-by: Marek Vasut <[email protected]> Cc: Wolfgang Denk <[email protected]> Cc: Detlev Zundel <[email protected]> Cc: Stefano Babic <[email protected]> Cc: Fabio Estevam <[email protected]> --- arch/arm/cpu/arm926ejs/mx28/mx28.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/arm/cpu/arm926ejs/mx28/mx28.c b/arch/arm/cpu/arm926ejs/mx28/mx28.c index 01445cd..550207e 100644 --- a/arch/arm/cpu/arm926ejs/mx28/mx28.c +++ b/arch/arm/cpu/arm926ejs/mx28/mx28.c @@ -50,9 +50,16 @@ void reset_cpu(ulong ignored) __attribute__((noreturn)); void reset_cpu(ulong ignored) { - struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; + struct mx28_lcdif_regs *lcdif_regs = + (struct mx28_lcdif_regs *)MXS_LCDIF_BASE; + + /* + * Shut down the LCD controller as it interferes with BootROM boot mode + * pads sampling. + */ + writel(LCDIF_CTRL_RUN, &lcdif_regs->hw_lcdif_ctrl_clr); /* Wait 1 uS before doing the actual watchdog reset */ writel(1, &rtc_regs->hw_rtc_watchdog); -- 1.7.9.5 _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
