From mboxrd@z Thu Jan 1 00:00:00 1970 From: robert.jarzmik@free.fr (Robert Jarzmik) Date: Mon, 06 Oct 2014 21:29:36 +0200 Subject: [PATCH] Revert "ARM: pxa: call debug_ll_io_init for earlyprintk" In-Reply-To: <87egulausv.fsf@free.fr> (Robert Jarzmik's message of "Mon, 06 Oct 2014 20:59:28 +0200") References: <1412602320-22896-1-git-send-email-dbaryshkov@gmail.com> <87egulausv.fsf@free.fr> Message-ID: <87a959aten.fsf@free.fr> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Robert Jarzmik writes: > Dmitry Eremin-Solenikov writes: > >> This reverts commit 2111667b4677 ("ARM: pxa: call debug_ll_io_init for >> earlyprintk") >> >> This commit gives the following backtrace on PXA/tosa early in the boot >> time when DEBUG_LL is enabled. It is due to overlap between uart memory >> and PERIPH_ memory block mapped by pxa_map_io. > > Indeed, all available UARTs IO mappings are already covered by pxa_map_io(), so > the revert will remove the bug and keep the DEBUG_LL functionality. I suppose > you did the test with the revert and the lowlevel debugging works, right ? Actually, I have a question for Andrew : was your commit aimed at the 3 or 4 available UARTs (ie. in peripheral address space), or is it a case where an external UART is mapped on the system bus (if that is possible) ? -- Robert