From: Scott Wood <scottwood@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 03/22] powerpc/mpc85xx: move debug tlb entry after TLB is in known state
Date: Wed, 31 Oct 2012 17:51:09 -0500 [thread overview]
Message-ID: <1351723869.13377.16@snotra> (raw)
In-Reply-To: <70CC66F5C30A414DADDA6973E4CA391A73CA5E@039-SN1MPN1-002.039d.mgd.msft.net> (from B29882@freescale.com on Wed Oct 31 17:45:00 2012)
On 10/31/2012 05:45:00 PM, McClintock Matthew-B29882 wrote:
> On Wed, Oct 31, 2012 at 5:43 PM, Matthew McClintock
> <msm@freescale.com> wrote:
> > On Wed, Oct 31, 2012 at 5:08 PM, Scott Wood
> <scottwood@freescale.com> wrote:
> >> On 10/31/2012 01:17:31 AM, Prabhakar Kushwaha wrote:
> >>>
> >>> On 10/31/2012 02:37 AM, Scott Wood wrote:
> >>>>
> >>>> On 10/30/2012 04:26:16 AM, Prabhakar Kushwaha wrote:
> >>>> I'd rather not see this split this up. This file is too much of
> a
> >>>> complicated ifdef mess already.
> >>>>
> >>>> The window during which you won't be able to use breakpoints is
> not that
> >>>> large.
> >>>> There are other debugging techniques that can be used.
> >>>
> >>>
> >>> Can you please share the other techniques. It will help us in
> future.
> >>
> >>
> >> For debugging early boot hangs I usually put a branch-to-self
> somewhere in
> >> the sequence, and use CCS to see if we're spinning there or if we
> went off
> >> to some exception or other badness. Then I do a binary search,
> moving the
> >> branch to self around, to determine where things went wrong.
> >
> > LR can be handy to look at too to see what the calling function /
> branch was.
>
> And to add more... It's even more helpful when you did not instrument
> your code with a branch to self yet, since sometimes you can find out
> a good starting point for placing the branch to self in the first
> place.
Sure, what I wrote was meant for situations where the register dump
after you get in a bad state is not very useful, as was often the case
when debugging this code (infrequent use of LR, stuck in an exception
handler that repeatedly raises itself, obliterating the original
SRR0). Sometimes I've seen the chip get stuck so hard that you can't
even get register info out.
-Scott
next prev parent reply other threads:[~2012-10-31 22:51 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-22 0:01 [U-Boot] [RFC PATCH 00/17] Convert p1_p2_rdb_pc to new spl Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 01/17] Add u-boot-pad.bin target to the Makefile Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 02/17] spl: rename u-boot-pad.bin to u-boot-with-spl.bin Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 03/17] powerpc: remove .fixup test Scott Wood
2012-09-24 15:30 ` Peter Tyser
2012-09-24 18:47 ` Scott Wood
2012-09-24 23:38 ` Tom Rini
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 04/17] powerpc/mpc85xx: fix TLB alignment Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 05/17] powerpc/mpc8xxx: move LAW code into arch/powerpc/cpu/mpc8xxx Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 06/17] spl/mpc85xx: move udelay to cpu code Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 07/17] spl: include resetvec and lib8xxx Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 08/17] spl/powerpc: introduce CONFIG_SPL_INIT_MINIMAL Scott Wood
2012-09-24 23:48 ` Tom Rini
2012-09-24 23:52 ` Scott Wood
2012-09-25 0:03 ` Tom Rini
2012-09-25 0:17 ` Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 09/17] spl/85xx: new SPL support Scott Wood
2012-09-24 23:51 ` Tom Rini
2012-09-24 23:54 ` Scott Wood
2012-09-25 0:04 ` Tom Rini
2012-09-25 0:08 ` Scott Wood
2012-09-25 0:13 ` Tom Rini
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 10/17] powerpc/p1_p2_rdb_pc: " Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 11/17] spl/nand: introduce CONFIG_SPL_NAND_MINIMAL Scott Wood
2012-09-24 23:55 ` Tom Rini
2012-09-25 0:02 ` Scott Wood
2012-09-25 0:13 ` Tom Rini
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 12/17] spl/nand: config symbol documentation Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 13/17] spl/nand: Add minimal-spl driver for Freescale eLBC NAND Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 14/17] spl: introduce CONFIG_SPL_TARGET Scott Wood
2012-09-22 0:12 ` Tom Rini
2012-09-24 18:54 ` Scott Wood
2012-09-24 19:03 ` Tom Rini
2012-09-24 20:05 ` Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 15/17] p1_p2_rdb_pc: convert from nand_spl to new spl Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 16/17] powerpc/mpc85xx/p2020rdb-pc: fix SPL DDR config Scott Wood
2012-09-22 0:01 ` [U-Boot] [RFC PATCH 17/17] ns16550: wait for TENT before initializing Scott Wood
2012-10-01 14:27 ` [U-Boot] [u-boot-release] " Timur Tabi
2012-09-22 0:13 ` [U-Boot] [RFC PATCH 00/17] Convert p1_p2_rdb_pc to new spl Tom Rini
2012-09-24 18:50 ` Scott Wood
2012-09-24 19:06 ` Tom Rini
2012-09-24 19:15 ` Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 00/22] " Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 01/22] serial/ns16550: don't build serial_ns16550 with MIN_FUNCTIONS Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 02/22] serial/ns16550: wait for TEMT before initializing Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 03/22] powerpc/mpc85xx: move debug tlb entry after TLB is in known state Scott Wood
2012-10-30 9:26 ` Prabhakar Kushwaha
2012-10-30 21:07 ` Scott Wood
2012-10-31 6:17 ` Prabhakar Kushwaha
2012-10-31 22:08 ` Scott Wood
2012-10-31 22:44 ` McClintock Matthew-B29882
[not found] ` <CAEsOVNeZAyH1nxfgnjPYUG4=7yxjF9rjsRWrpa=WYW8edfiM3Q@mail.gmail.com>
2012-10-31 22:45 ` McClintock Matthew-B29882
2012-10-31 22:51 ` Scott Wood [this message]
2012-11-16 2:12 ` Scott Wood
2012-11-26 20:53 ` Andy Fleming
2012-10-30 2:04 ` [U-Boot] [PATCH v2 04/22] powerpc/mpc85xx: add comma before "already enabled" Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 05/22] Add u-boot-pad.bin target to the Makefile Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 06/22] spl: rename u-boot-pad.bin to u-boot-with-spl.bin Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 07/22] spl: introduce CONFIG_SPL_TARGET Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 08/22] powerpc: change .fixup test to a GCC version test Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 09/22] powerpc/mpc85xx: fix TLB alignment Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 10/22] powerpc/mpc8xxx: move LAW code into arch/powerpc/cpu/mpc8xxx Scott Wood
2012-10-30 2:04 ` [U-Boot] [PATCH v2 11/22] spl/mpc85xx: move udelay to cpu code Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 12/22] spl: include resetvec and lib8xxx Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 13/22] spl/mpc85xx: rename cpu_init_nand.c to spl_minimal.c Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 14/22] powerpc/mpc85xx: consistently use COBJS-y Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 15/22] spl/powerpc: introduce CONFIG_SPL_INIT_MINIMAL Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 16/22] spl/85xx: new SPL support Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 17/22] powerpc/mpc85xx/p1_p2_rdb_pc: " Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 18/22] spl/nand: introduce CONFIG_SPL_NAND_DRIVERS, _BASE, and _ECC Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 19/22] spl/nand: config symbol documentation Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 20/22] powerpc/mpc85xx/p1_p2_rdb_pc: convert from nand_spl to new spl Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 21/22] powerpc/mpc85xx/p1_p2_rdb_pc: clean up memory map Scott Wood
2012-10-30 2:05 ` [U-Boot] [PATCH v2 22/22] powerpc/mpc85xx/p2020rdb-pca: Use L2 SRAM for SPL boot Scott Wood
2012-10-30 3:17 ` Tabi Timur-B04825
2012-10-30 23:37 ` Scott Wood
2012-11-13 22:41 ` [U-Boot] [PATCH v3] " Scott Wood
2012-10-30 17:04 ` [U-Boot] [PATCH v2 00/22] Convert p1_p2_rdb_pc to new spl Tom Rini
2012-10-30 20:17 ` Scott Wood
2012-10-30 21:12 ` Tom Rini
2012-11-13 22:42 ` Scott Wood
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