AM3351: NAND optimization on custom board

Michael Shklyarman

Part Number: AM3351

Hi ,

Customer designed own board with NAND attached to AM3351 and is looking to ensure the GPMC configuration is optimal for the geometry and timing of the NAND part they picked. Will appreciate your guidance

thank you

Michael

over 2 years ago

0 Hong Guan64 over 2 years ago

TI__Guru* 75890 points

Hello Michael,
Let's first run a quick test on the customer board.
Can we share the serial dump when running cmds @u-boot?
=> nand info
=> mtdparts
=> time nand read ${loadaddr} NAND.kernel
Best,
-Hong

0 Michael Shklyarman over 2 years ago in reply to Hong Guan64

TI__Genius 12850 points

U-Boot 2023.04-gd74d0993e2 (Oct 18 2023 - 17:49:46 +0000)

CPU : AM335X-GP rev 2.1

DRAM: 128 MiB

Core: 150 devices, 12 uclasses, devicetree: separate

WDT: Started wdt@44e35000 with servicing every 1000ms (60s timeout)

NAND: 256 MiB

Loading Environment from NAND... OK

Loading Environment from nowhere... OK

<ethaddr> not set. Validating first E-fuse MAC

Net: eth2: usb_ether

Hit any key to stop autoboot: 0

=> nand info

Device 0: nand0, sector size 128 KiB

Page size 2048 b

OOB size 128 b

Erase size 131072 b

ecc strength 16 bits

ecc step size 512 b

subpagesize 512 b

options 0x4000400c

bbt options 0x00008000

=> mtdparts

device nand0 <nand.0>, # parts = 14

#: name size offset mask_flags

0: SPL 0x00020000 0x00000000 0

1: SPL.backup1 0x00020000 0x00020000 0

2: SPL.backup2 0x00020000 0x00040000 0

3: SPL.backup3 0x00020000 0x00060000 0

4: u-boot-spl-os 0x00040000 0x00080000 0

5: u-boot 0x00100000 0x000c0000 0

6: u-boot-env 0x00020000 0x001c0000 0

7: u-boot-env.backup1 0x00020000 0x001e0000 0

8: reserved1 0x00200000 0x00200000 0

9: kernel_a 0x00c00000 0x00400000 0

10: rootfs_a 0x04a00000 0x01000000 0

11: kernel_b 0x00c00000 0x05a00000 0

12: rootfs_b 0x04a00000 0x06600000 0

13: userdata 0x05000000 0x0b000000 0

active partition: nand0,0 - (SPL) 0x00020000 @ 0x00000000

defaults:

mtdids : nand0=nand.0

mtdparts: mtdparts=nand.0:128k(SPL),128k(SPL.backup1),128k(SPL.backup2),128k(SPL.backup3),256k(u-boot-spl-os),1m(u-boot),128k(u-boot-env),128k(u-boot-env.backup1),2m(reserved1),12m(kernel_a),74m(rootfs_a),12m(kernel_b),74m(rootfs_b),-(userdata)

=> time nand read ${loadaddr} kernel_a

NAND read: device 0 offset 0x400000, size 0xc00000

12582912 bytes read: OK

time: 6.678 seconds

0 Hong Guan64 over 2 years ago in reply to Michael Shklyarman

TI__Guru* 75890 points

Hello Michael,
Thanks for running the test on the customer board.
Let's apply the attached u-boot "testing patch", and share the result from running the same cmds @u-boot.
Best,
-Hong

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/0001_2D00_GPMC_2D00_NAND_2D00_register_2D00_timing_2D00_in_2D00_SPL_2D00_for_2D00_the_2D00_NAND_2D00_on_2D00_AM3.patch

0 Michael Shklyarman over 2 years ago in reply to Hong Guan64

TI__Genius 12850 points

Hi Hong,

Here is the new time measurement.

=> nand info

Device 0: nand0, sector size 128 KiB

Page size 2048 b

OOB size 128 b

Erase size 131072 b

ecc strength 16 bits

ecc step size 512 b

subpagesize 512 b

options 0x4000400c

bbt options 0x00008000

=> time nand read ${loadaddr} kernel_a

NAND read: device 0 offset 0x400000, size 0xc00000

12582912 bytes read: OK

time: 2.577 seconds

thanks

Michael

0 Hong Guan64 over 2 years ago in reply to Michael Shklyarman

TI__Guru* 75890 points

Hello Michael,
It looks like NAND read performance is improved x2.5.

For your reference, I'm attaching NAND read performance test @u-boot on AM335x EVM (1GHz Part)
- am3_9.1.0.1_gpmc_rd.log: with the current GPMC timing parameter configuration
- am3_9.1.0.1_patch_gpmc_rd.log: with the updated GPMC timing parameter configuration
=> NAND read time is improved x4 on reading 8Mbytes @u-boot with the updated GPMC timing parameter
1.85Mbyte/s with the current GPMC parameter timing parameter
7.7Mbyte/s with the updated GPMC parameter timing parameter

Best,
-Hong

Fullscreen am3_9.1.0.1_gpmc_rd.log Download

U-Boot 2023.04-gd74d0993e2 (Oct 18 2023 - 17:49:46 +0000)

CPU  : AM335X-GP rev 2.1
Model: TI AM335x EVM
DRAM:  1 GiB
Core:  156 devices, 17 uclasses, devicetree: separate
WDT:   Started wdt@44e35000 with servicing every 1000ms (60s timeout)
NAND:  256 MiB
MMC:   OMAP SD/MMC: 0
Loading Environment from FAT... Unable to read "uboot.env" from mmc0:1... 
<ethaddr> not set. Validating first E-fuse MAC
Net:   eth2: ethernet@4a100000, eth3: usb_ether
Hit any key to stop autoboot:  2  0 
=> nand info

Device 0: nand0, sector size 128 KiB
  Page size         2048 b
  OOB size            64 b
  Erase size      131072 b
  ecc strength         8 bits
  ecc step size      512 b
  subpagesize        512 b
  options       0x0000400c
  bbt options   0x00008000
  
=> mtdparts

device nand0 <nand.0>, # parts = 10
 #: name		size		offset		mask_flags
 0: NAND.SPL            0x00020000	0x00000000	0
 1: NAND.SPL.backup1    0x00020000	0x00020000	0
 2: NAND.SPL.backup2    0x00020000	0x00040000	0
 3: NAND.SPL.backup3    0x00020000	0x00060000	0
 4: NAND.u-boot-spl-os  0x00040000	0x00080000	0
 5: NAND.u-boot         0x00100000	0x000c0000	0
 6: NAND.u-boot-env     0x00020000	0x001c0000	0
 7: NAND.u-boot-env.backup10x00020000	0x001e0000	0
 8: NAND.kernel         0x00800000	0x00200000	0
 9: NAND.file-system    0x0f600000	0x00a00000	0

active partition: nand0,0 - (NAND.SPL) 0x00020000 @ 0x00000000

defaults:
mtdids  : nand0=nand.0
mtdparts: mtdparts=nand.0:128k(NAND.SPL),128k(NAND.SPL.backup1),128k(NAND.SPL.backup2),128k(NAND.SPL.backup3),256k(NAND.u-boot-spl-os),1m(NAND.u-boot),128k(NAND.u-boot-env),128k(NAND.u-boot-env.backup1),8m(NAND.kernel),-(NAND.file-system)

=> md.l 0x50000060 0x7
50000060: 00000800 001e1e00 001e1e00 16051807  ................
50000070: 00151e1e 16000f80 00000f48           ........H...

=> time nand read ${loadaddr} NAND.kernel

NAND read: device 0 offset 0x200000, size 0x800000
 8388608 bytes read: OK

time: 4.332 seconds

=>

Fullscreen am3_9.1.0.1_patch_gpmc_rd.log Download

U-Boot 2023.04-00001-ga6b09c3a4c-dirty (Feb 07 2024 - 10:30:04 -0600)

CPU  : AM335X-GP rev 2.1
Model: TI AM335x EVM
DRAM:  1 GiB
Core:  156 devices, 17 uclasses, devicetree: separate
WDT:   Started wdt@44e35000 with servicing every 1000ms (60s timeout)
NAND:  256 MiB
MMC:   OMAP SD/MMC: 0
Loading Environment from FAT... Unable to read "uboot.env" from mmc0:1... 
<ethaddr> not set. Validating first E-fuse MAC
Net:   eth2: ethernet@4a100000, eth3: usb_ether
Hit any key to stop autoboot:  2  0 
=> nand info

Device 0: nand0, sector size 128 KiB
  Page size         2048 b
  OOB size            64 b
  Erase size      131072 b
  ecc strength         8 bits
  ecc step size      512 b
  subpagesize        512 b
  options       0x0000400c
  bbt options   0x00008000
=> mtdparts

device nand0 <nand.0>, # parts = 10
 #: name		size		offset		mask_flags
 0: NAND.SPL            0x00020000	0x00000000	0
 1: NAND.SPL.backup1    0x00020000	0x00020000	0
 2: NAND.SPL.backup2    0x00020000	0x00040000	0
 3: NAND.SPL.backup3    0x00020000	0x00060000	0
 4: NAND.u-boot-spl-os  0x00040000	0x00080000	0
 5: NAND.u-boot         0x00100000	0x000c0000	0
 6: NAND.u-boot-env     0x00020000	0x001c0000	0
 7: NAND.u-boot-env.backup10x00020000	0x001e0000	0
 8: NAND.kernel         0x00800000	0x00200000	0
 9: NAND.file-system    0x0f600000	0x00a00000	0

active partition: nand0,0 - (NAND.SPL) 0x00020000 @ 0x00000000

defaults:
mtdids  : nand0=nand.0
mtdparts: mtdparts=nand.0:128k(NAND.SPL),128k(NAND.SPL.backup1),128k(NAND.SPL.backup2),128k(NAND.SPL.backup3),256k(NAND.u-boot-spl-os),1m(NAND.u-boot),128k(NAND.u-boot-env),128k(NAND.u-boot-env.backup1),8m(NAND.kernel),-(NAND.file-system)
=> md.l 0x50000060 0x7
50000060: 00000800 00050500 00050401 04000600  ................
50000070: 00070909 84000000 00000f48           ........H...
=> time nand read ${loadaddr} NAND.kernel

NAND read: device 0 offset 0x200000, size 0x800000
 8388608 bytes read: OK

time: 1.038 seconds
=>

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AM3351: NAND optimization on custom board