Hi Sascha,
On Tue, May 10, 2016 at 08:24:43AM +0200, Sascha Hauer wrote:
> subpage read support can significantly speed up scanning UBI volumes, so
> add support for it. This is inspired by the corresponding Kernel commit.
> Unlike in the kernel we add subpage read support for i.MX28 aswell.
> Testing it on i.MX28 revealed no problems.
>
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Here is my
Tested-by: Stefan Christ <s.christ@xxxxxxxxx>
I measured the ubiattach time for two different NAND chips after an ubiformat
on the devices. It's around 30% faster. Here are the results:
nand: NAND device: Manufacturer ID: 0x01, Chip ID: 0xd3
(AMD/Spansion S34ML08G2), 1024MiB, page size: 2048, OOB size: 128
# without patches
barebox@Phytec phyFLEX-i.MX6 Quad Carrier-Board:/ time ubiattach /dev/nand0.root
UBI: scanning is finished
UBI: registering /dev/nand0.root.ubi
UBI: attached mtd0 (name "nand0.root", size 1010 MiB) to ubi0
time: 9208ms
# with patches
barebox@Phytec phyFLEX-i.MX6 Quad Carrier-Board:/ time ubiattach /dev/nand0.root
time: 6524ms
# Saved time 2684ms (-29%)
nand: NAND device: Manufacturer ID: 0x2c, Chip ID: 0xdc
(Micron MT29F4G08ABADAWP), 512MiB, page size: 2048, OOB size: 64
# without patches
barebox@Phytec phyCORE-i.MX6 Duallite/SOLO with NAND:/ time ubiattach /dev/nand0.root
time: 4158ms
# with patches
barebox@Phytec phyCORE-i.MX6 Duallite/SOLO with NAND:/ time ubiattach /dev/nand0.root
time: 2842ms
# Saved time 1316ms (-31%)
Mit freundlichen Grüßen / Kind regards,
Stefan Christ
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