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doc: correct description of crash dumps

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Correct the description of the ESR register.

Fix a typo.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-07-09 08:12:06 +02:00 • committed by Tom Rini
parent 76ae74d348
commit dd43272be1
1 changed files with 5 additions and 3 deletions
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8
doc/develop/crash_dumps.rst
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@ -5,7 +5,7 @@ Analyzing crash dumps
=====================
When the CPU detects an instruction that it cannot execute it raises an
interrupt. U-Boot than writes a crash dump. This chapter describes how such
interrupt. U-Boot then writes a crash dump. This chapter describes how such
dump can be analyzed.
Creating a crash dump voluntarily
@ -46,8 +46,10 @@ QEMU::
resetting ...
The first line provides us with the type of interrupt that occurred.
(On ARMv8 a synchronous abort is an exception where the return address stored
in the ESR register indicates the instruction that caused the exception.)
On ARMv8 a synchronous abort is an exception thrown when hitting an unallocated
instruction. The exception syndrome register ESR register contains information
describing the reason for the exception. Bit 25 set here indicates that a 32 bit
instruction led to the exception.
The second line provides the contents of the elr and the lr register after
subtracting the relocation offset. - U-Boot relocates itself after being