** Changed in: linux-linaro-vexpress (Ubuntu)
Status: Confirmed => Invalid
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Title:
USB/mmc rootfs conflict - vexpress
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** Changed in: linux-linaro (Ubuntu)
Status: Confirmed => Invalid
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Title:
USB/mmc rootfs conflict - vexpress
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This is a backport of 8301bb68c6bb9836889641a47443aeb97b763f6c commit
in the main line tree.
** Patch added: "ARM: 6310/1: mmci: support different FIFO sizes"
https://bugs.launchpad.net/ubuntu/+source/linux-linaro/+bug/632798/+attachment/1901485/+files/0001-ARM-6310-1-mmci-support-different-F
This patch adds support for MMCI with extended FIFO size. Kernels prior
to 2.6.37 will also need backported commit
8301bb68c6bb9836889641a47443aeb97b763f6c "ARM: 6310/1: mmci: support
different FIFO sizes" (will attach it to this bug).
** Patch added: "[PATCH] arm: mmci: Add ARM variant with exten
The problem will be worked around by extending the MMC FIFO size. This
will be available in the coming VE CD release. A patch will be required
on non-mainline kernels to support it.
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https
Yes, the bug is still valid. However, there is some work being done on
this issue now.
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Title:
USB/mmc rootfs conflict - vexpress
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No comments for two months. Is this bug still valid?
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Title:
USB/mmc rootfs conflict - vexpress
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Hack it is, without doubts ;-) I've already sent it upstream anyway,
we'll see...
Now, a word of comment:
At least some of the Linaro file system images are running irqbalance
daemon, which will most likely play with MMC and USB interrupts
affiliation in runtime. To prevent it from doing so,
/etc
Paweł,
Even though this may not be ideal, is it really a hack? It only affects
the Versatile Express platform and it does improve the mmc access times
significantly. I can see scenarios where there could be problems, but
leaving the mmc system the way it is means the mmc is pretty much
unusable
Have a look at this patch...
** Patch added: "0001-arm-Improve-MMC-performance-on-Versatile-Express.patch"
https://bugs.launchpad.net/ubuntu/+source/linux-linaro/+bug/632798/+attachment/1801527/+files/0001-arm-Improve-MMC-performance-on-Versatile-Express.patch
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It may be even worse - I have some reports that with recent changes in
L2 handling, all hell breaks loose during MMC operations. I'll start
investigating this next week.
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** Changed in: linux-linaro-vexpress (Ubuntu)
Status: New => Confirmed
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Title:
USB/mmc rootfs conflict - vexpress
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Is this still broken in 2.6.37?
** Also affects: linux-linaro-vexpress (Ubuntu)
Importance: Undecided
Status: New
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Title:
USB/mmc rootf
** Changed in: linux-linaro (Ubuntu)
Status: New => Confirmed
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** Branch linked: lp:~mwaddel/linaro-image-tools/usb-rootfs-option
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ARM Bug tracking system - https://silver.arm.com/ - the case number is
472555
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ubun
I did some further investigations...
1. MMC access are generally terribly slow - 45-50 kB/s writes, 60-65
kB/s reads. Expected value at least in hundreds kB/s - normal cards have
maximum throughput at least 1 MB/s, premium cards up to 5-10 MB/s!
2. USB accesses performed at the same time as MMC o
** Changed in: linux-linaro (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux-linaro (Ubuntu)
Assignee: (unassigned) => Matt Waddel (mwaddel)
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** Tags added: armel vexpress
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