Re: [BUG] silent hangup when debugging lib/fdtdec.c

[Tom Rini <trini@konsulko.com>]

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On Tue, Jan 13, 2026 at 09:52:35AM +0100, alexander.feilke@ew.tq-group.com wrote:
> > > 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?
> > >
> > 
> > I can boot and reproduce the hangup issue on mx7dsabresd:
> > 
> > <debug_uart>
> > FDT 8787da38 gd 0091de20
> > top 87887538 sp 87800000
> > sys_init_sp_addr 0091ff10
> > gbl_data_size 000000f0
> > FDT overlap
> > resetting ...
> > System reset not supported on this platform
> > ### ERROR ### Please RESET the board ###
> 
> Just want to revive this topic as the issue is still unresolved.

OK, so looking at this, it's a "feature" as the check doesn't take in to
account that we might not have relocated gd out of initial memory (in
this case, 0x009.....) and in to sdram (0x8.......) and so is a faulty
check.

-- 
Tom

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