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powerpc/fadump: Update fadump documentation

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With the unnecessary restriction to reserve memory for fadump at the
top of RAM forgone, update the documentation accordingly.

Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Hari Bathini 2017-03-17 02:35:42 +05:30 committed by Michael Ellerman
parent f6e6bedb77
commit bc183779de
1 changed files with 17 additions and 17 deletions
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34
Documentation/powerpc/firmware-assisted-dump.txt
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@ -105,21 +105,21 @@ memory is held.
If there is no waiting dump data, then only the memory required If there is no waiting dump data, then only the memory required
to hold CPU state, HPTE region, boot memory dump and elfcore to hold CPU state, HPTE region, boot memory dump and elfcore
header, is reserved at the top of memory (see Fig. 1). This area header, is usually reserved at an offset greater than boot memory
is *not* released: this region will be kept permanently reserved, size (see Fig. 1). This area is *not* released: this region will
so that it can act as a receptacle for a copy of the boot memory be kept permanently reserved, so that it can act as a receptacle
content in addition to CPU state and HPTE region, in the case a for a copy of the boot memory content in addition to CPU state
crash does occur. and HPTE region, in the case a crash does occur.
o Memory Reservation during first kernel o Memory Reservation during first kernel
Low memory Top of memory Low memory Top of memory
0 boot memory size | 0 boot memory size |
| | |<--Reserved dump area -->| | | |<--Reserved dump area -->| |
V V | Permanent Reservation V V V | Permanent Reservation | V
+-----------+----------/ /----------+---+----+-----------+----+ +-----------+----------/ /---+---+----+-----------+----+------+
| | |CPU|HPTE| DUMP |ELF | | | |CPU|HPTE| DUMP |ELF | |
+-----------+----------/ /----------+---+----+-----------+----+ +-----------+----------/ /---+---+----+-----------+----+------+
| ^ | ^
| | | |
\ / \ /
@ -135,12 +135,12 @@ crash does occur.
0 boot memory size | 0 boot memory size |
| |<------------- Reserved dump area ----------- -->| | |<------------- Reserved dump area ----------- -->|
V V V V V V
+-----------+----------/ /----------+---+----+-----------+----+ +-----------+----------/ /---+---+----+-----------+----+------+
| | |CPU|HPTE| DUMP |ELF | | | |CPU|HPTE| DUMP |ELF | |
+-----------+----------/ /----------+---+----+-----------+----+ +-----------+----------/ /---+---+----+-----------+----+------+
| | | |
V V V V
Used by second /proc/vmcore Used by second /proc/vmcore
kernel to boot kernel to boot
Fig. 2 Fig. 2