On Tue, Nov 25, 2025 at 05:14:12PM +0100, Alexander Feilke wrote: > From: Alexander Feilke <[email protected]> > > Description: U-Boot hangs silently during boot when enabling DEBUG in > lib/fdtdec.c > > Not sure if its really a bug or rather a configuration issue on my side. > > Minimal steps to reproduce: <see patch> > > The hang is caused by `panic("FDT overlap");` later inside the if block. > (see `lib/fdtdec.c:1279` in `fdt_find_separate(void)`) > > Additionally, no boot log can be seen because serial is initialized after > loading the devicetree in this boot stage (see `common/board_r.c:665` in > `initcall_run_r(void)`) > > Tested on i.MX6 with configs for tqma6d_mba6 and other tq boards that aren't, > mainlined yet (tqma6ulx_mba6ul and tqma7d_mba7). > > Any idea what to look for to fix this on our side? > > Thanks in advance, > Alexander > --- > lib/fdtdec.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/lib/fdtdec.c b/lib/fdtdec.c > index c38738b48c7..0f2f7c948cd 100644 > --- a/lib/fdtdec.c > +++ b/lib/fdtdec.c > @@ -1257,7 +1257,7 @@ static void *fdt_find_separate(void) > /* FDT is at end of image */ > fdt_blob = (ulong *)_end; > > - if (_DEBUG && !fdtdec_prepare_fdt(fdt_blob)) { > + if (1 && !fdtdec_prepare_fdt(fdt_blob)) { > int stack_ptr; > const void *top = fdt_blob + fdt_totalsize(fdt_blob); >
For very early failures you might need to look at enabling DEBUG_UART which wires in a more direct "just write this to serial port". -- Tom
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