AM335x UBI support in u boot

sooraj r k

Other Parts Discussed in Thread: AM3352

Hi ,

Im using a custom design board with AM3352 processor running at 300 MHz.

attaching ubi image of about 40 MB size from u-boot using following command takes 5 secs

ubi part rootfs 2048

But when it is attached from kernel it takes only about 1.3 sec.

What could be the reason? Can any one help me here

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

I will ask the software team to comment.

0 Yordan Kovachev over 9 years ago

TI__Guru**** 161600 points

Hi,

Have you checked against kernel performance guide:
processors.wiki.ti.com/.../Processor_SDK_Linux_Kernel_Performance_Guide

Also inspect the gpmc & nand drivers in both u-boot & kernel (especially the way gpmc is initialized, i.e.: ecc, clock speed, etc..).

Best Regards,
Yordan

0 sooraj r k over 9 years ago in reply to Yordan Kovachev

Intellectual 415 points

Hi,

Thanks for the reply, was going to compare gpmc and nand drivers..
but it would be great help if someone who already has attached ubi image from u-boot tell me whether they have experienced same time difference,
and whether booting kernel from boot directory of root filesystem in case of Nand device is a good option to follow or not.

0 sooraj r k over 9 years ago

Intellectual 415 points

UBI related informations

mtdinfo output
mtd6
Name:                           NAND.file-system
Type:                           nand
Eraseblock size:                131072 bytes, 128.0 KiB
Amount of eraseblocks:          1663 (217972736 bytes, 207.9 MiB)
Minimum input/output unit size: 2048 bytes
Sub-page size:                  512 bytes
OOB size:                       64 bytes
Character device major/minor:   90:12
Bad blocks are allowed:         true
Device is writable:             true

arguments used for creation
# UBI: smallest flash I/O unit:    2048
# UBI: logical eraseblock size:    126976 bytes
# UBI: logical eraseblock no.s:       1619 LEBs
MKUBIFS_ARGS = "-F -m 2048 -e 126976 -c 1619"

# UBI: smallest flash I/O unit:    2048
# UBI: physical eraseblock size:   131072 bytes (128 KiB)
# UBI: sub-page size:              2048
UBINIZE_ARGS = "-m 2048 -p 128KiB -s 2048"

ubinize.cfg contents
[ubifs]
mode=ubi
image={my loc}
vol_id=0
vol_type=dynamic
vol_name= rootfs
vol_flags=autoresize

ubi part output from u-boot

ubi0: attaching mtd1
ubi0: scanning is finished
ubi0: attached mtd1 (name "mtd=4", size 207 MiB)
ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 512
ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096
ubi0: good PEBs: 1663, bad PEBs: 0, corrupted PEBs: 0
ubi0: user volume: 1, internal volumes: 1, max. volumes count: 128
ubi0: max/mean erase counter: 2/0, WL threshold: 4096, image sequence number: 290038407
ubi0: available PEBs: 0, total reserved PEBs: 1663, PEBs reserved for bad PEB handling: 40

ubi info output from u-boot
UBI: MTD device name:            "mtd=4"
UBI: MTD device size:            207 MiB
UBI: physical eraseblock size:   131072 bytes (128 KiB)
UBI: logical eraseblock size:    126976 bytes
UBI: number of good PEBs:        1663
UBI: number of bad PEBs:         0
UBI: smallest flash I/O unit:    2048
UBI: VID header offset:          2048 (aligned 2048)
UBI: data offset:                4096
UBI: max. allowed volumes:       128
UBI: wear-leveling threshold:    4096
UBI: number of internal volumes: 1
UBI: number of user volumes:     1
UBI: available PEBs:             0
UBI: total number of reserved PEBs: 1663
UBI: number of PEBs reserved for bad PEB handling: 40
UBI: max/mean erase counter: 2/0

0 sooraj r k over 9 years ago in reply to Yordan Kovachev

Intellectual 415 points

Hi ,
gone through

e2e.ti.com/.../222527
e2e.ti.com/.../312922

In those we are advised to enable dcache.

Im using a newer version of u-boot
u-boot source from
git://git.ti.com/ti-u-boot/ti-u-boot.git;
banch :- ti-u-boot-2016.05

I have tried using dcache on command in my u-boot without any improvement in time.

Am I missing some configuration here?
Im not using CONFIG_DM_NAND will that be causing issue? or something like that?

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AM335x UBI support in u boot