OLPC SW ECO - SD CARD CORRUPTION: Difference between revisions
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(New page: This is an unscheduled software release. == Summary == ; Title: SD card corruption workaround ; Date proposed: 2008-06-23 ; Target date: week of...) |
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; Special testing required: |
; Special testing required: |
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; Rollout: |
; Rollout: |
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:* Manufacturing: |
:* Manufacturing: TBD |
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:* G1G1 users should upgrade to this build to pick up new kernel |
:* G1G1 users should upgrade to this build to pick up new kernel |
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:* Field: TBD |
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:* Field: automated upgrade to all machines running 8.1.1 |
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; Discussion: [[Talk:OLPC_SW_SD_CARD|Comments/discussion]] |
; Discussion: [[Talk:OLPC_SW_SD_CARD|Comments/discussion]] |
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; Checklist: [[OLPC SW ECO - SD Card Corruption - Checklist]] (initially cloned from [[USR_Checklist]]) |
; Checklist: [[OLPC SW ECO - SD Card Corruption - Checklist]] (initially cloned from [[USR_Checklist]]) |
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===Summary=== |
===Summary=== |
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While this issue will most probably not impact laptops deployed in schools as it requires an EXT3 formatted card which means someone manually formatting it, it has impacted G1G1 users and requires |
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This |
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some sort of update that can be installed by users. |
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==Final test== |
==Final test== |
Revision as of 23:51, 23 June 2008
This is an unscheduled software release.
Summary
- Title
- SD card corruption workaround
- Date proposed
- 2008-06-23
- Target date
- week of 2008-07-07
- Trac items
- 6532 - SD corruption on suspend/resume.
- Priority
- High. We have seen multiple reports of this from G1G1 users.
- Champion
- Deepak Saxena
- Reviewers
- Reviewers should include: Chris Ball, Andres Salomon, Michael Stone
- Special testing required
- Rollout
-
- Manufacturing: TBD
- G1G1 users should upgrade to this build to pick up new kernel
- Field: TBD
- Discussion
- Comments/discussion
- Checklist
- OLPC SW ECO - SD Card Corruption - Checklist (initially cloned from USR_Checklist)
Issue list
- If you suspend/resume an XO with a mounted, ext3-formatted partition on and SD card, the card's partition table and card geometry data will be wiped out.
- This is a critical bug as data is lost
- Root cause: The root cause of this bug is 1339, a long wake up time for the CAFE SD controller. Due to this long delay, the kernel queries the SD controller before it has detected the card and does not recognize that the card as the one that was plugged in at suspend time. For a more detailed explanation, see the discussion in trac (6532).
Proposed Fix(es)
Patch for issue is [[1]]
Changed packages, from 703:
- kernel
Suggested tests
- The laptop should go through a large number of suspend/resume cycles with a mounted, EXT3-formatted partition on an SD card with no corruption.
Test Results
Suspend Resume Test
- Deepak Saxena unit tested the patch and conducted over 500 suspend/resume cycles with no corruption.
- Todo: Run more cycles in QA testbed
Upgrades
- Clean install:
- Network upgrade: .
Generic Tests
- One hour smoke test:
Summary
While this issue will most probably not impact laptops deployed in schools as it requires an EXT3 formatted card which means someone manually formatting it, it has impacted G1G1 users and requires some sort of update that can be installed by users.