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AM335x SDK 07.00.00.00 GPMC prefetch DMA support

Oleg Belogolov
Expert 3865 points

Hi Team,

following tests were done with SDK 7.0 on the AM335x EVM.

According to the logs below the prefetch-DMA doesn't work, according to NAND User Guide it should:

http://processors.wiki.ti.com/index.php/Linux_Core_NAND_User%27s_Guide

Could you please help to clarify the issue?

Thanks and regards,

Oleg

 

 Images from ti-sdk-am335x-evm-07.00.00.00

Devive booted, Nand is recognized.

 

[    0.000000] Linux version 3.12.10-ti2013.12.01 (jenkins@sdit-build02) (gcc version 4.7.3 20130226 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2013.03-20130313 - Linaro GCC 2013.03) ) #1 Sun Mar 30 20:55:31 CDT 2014

…

[    1.698723] ONFI param page 0 valid

[    1.702470] ONFI flash detected

[    1.705800] NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron MT29F2G08ABAEAWP), 256MiB, page size: 2048, OOB size: 64

[    1.717876] omap2-nand: detected x8 NAND flash

[    1.722584] nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme

[    1.728232] omap2-nand: using custom ecc layout

[    1.733299] 10 ofpart partitions found on MTD device omap2-nand.0

[    1.739745] Creating 10 MTD partitions on "omap2-nand.0":

[    1.745501] 0x000000000000-0x000000020000 : "NAND.SPL"

[    1.752845] 0x000000020000-0x000000040000 : "NAND.SPL.backup1"

[    1.759932] mmc0: new SDIO card at address 0001

[    1.767449] 0x000000040000-0x000000060000 : "NAND.SPL.backup2"

[    1.775535] 0x000000060000-0x000000080000 : "NAND.SPL.backup3"

[    1.783240] 0x000000080000-0x0000000c0000 : "NAND.u-boot-spl-os"

[    1.791231] 0x0000000c0000-0x0000001c0000 : "NAND.u-boot"

[    1.799042] 0x0000001c0000-0x0000001e0000 : "NAND.u-boot-env"

[    1.806541] 0x0000001e0000-0x000000200000 : "NAND.u-boot-env.backup1"

[    1.814772] 0x000000200000-0x000000a00000 : "NAND.kernel"

[    1.828433] 0x000000a00000-0x000010000000 : "NAND.file-system"

 

 +added over the kernelconfig the MTD-Tests for performance measurement, it worked.

 

[    0.000000] Linux version 3.12.10-ti2013.12.01 (vm@vm-VirtualBox) (gcc version 4.7.3 20130226 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2013.03-20130313 - Linaro GCC 2013.03) ) #1 Thu Oct 16 10:49:59 CEST 2014

…

root@am335x-evm:~# modprobe mtd_speedtest dev=9

[  714.976169]

[  714.977775] =================================================

[  714.983945] mtd_speedtest: MTD device: 9

[  714.988503] mtd_speedtest: MTD device size 257949696, eraseblock size 131072, page size 2048, count of eraseblocks 1968, pages per eraseblock 64, OOB size 64

[  715.006413] mtd_test: scanning for bad eraseblocks

[  715.215541] mtd_test: scanned 1968 eraseblocks, 0 are bad

[  716.467579] mtd_speedtest: testing eraseblock write speed

[  765.110792] mtd_speedtest: eraseblock write speed is 5179 KiB/s

[  765.117105] mtd_speedtest: testing eraseblock read speed

[  797.002123] mtd_speedtest: eraseblock read speed is 7901 KiB/s

[  798.716836] mtd_speedtest: testing page write speed

[  847.533649] mtd_speedtest: page write speed is 5160 KiB/s

[  847.539384] mtd_speedtest: testing page read speed

[  879.519571] mtd_speedtest: page read speed is 7877 KiB/s

[  881.233702] mtd_speedtest: testing 2 page write speed

[  929.969635] mtd_speedtest: 2 page write speed is 5169 KiB/s

[  929.975579] mtd_speedtest: testing 2 page read speed

[  961.909842] mtd_speedtest: 2 page read speed is 7889 KiB/s

[  961.915689] mtd_speedtest: Testing erase speed

[  963.630299] mtd_speedtest: erase speed is 147398 KiB/s

[  963.635758] mtd_speedtest: Testing 2x multi-block erase speed

[  964.616548] mtd_speedtest: 2x multi-block erase speed is 258363 KiB/s

[  964.623398] mtd_speedtest: Testing 4x multi-block erase speed

[  965.602902] mtd_speedtest: 4x multi-block erase speed is 258628 KiB/s

[  965.609718] mtd_speedtest: Testing 8x multi-block erase speed

[  966.588449] mtd_speedtest: 8x multi-block erase speed is 258894 KiB/s

[  966.595281] mtd_speedtest: Testing 16x multi-block erase speed

[  967.574070] mtd_speedtest: 16x multi-block erase speed is 258894 KiB/s

[  967.580972] mtd_speedtest: Testing 32x multi-block erase speed

[  968.559671] mtd_speedtest: 32x multi-block erase speed is 258894 KiB/s

[  968.566589] mtd_speedtest: Testing 64x multi-block erase speed

[  969.545848] mtd_speedtest: 64x multi-block erase speed is 258628 KiB/s

[  969.552788] mtd_speedtest: finished

[  969.556928] =================================================

 

+added the DTS for am335x-evm with ti,nand-xfer-type = "prefetch-dma" support.

Patch:

diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts

index ec67e03..578c8d7 100644

--- a/arch/arm/boot/dts/am335x-evm.dts

+++ b/arch/arm/boot/dts/am335x-evm.dts

@@ -505,6 +505,7 @@

                                gpmc,wr-access-ns = <40>;

                                gpmc,wr-data-mux-bus-ns = <0>;

                                ti,nand-ecc-opt= "bch8";

+                               ti,nand-xfer-type = "prefetch-dma";

                                ti,elm-id = <&elm>;

                                /* MTD partition table */

                                /* All SPL-* partitions are sized to minimal length

 

 

[    1.708658] ONFI param page 0 valid

[    1.712413] ONFI flash detected

[    1.715741] NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron MT29F2G08ABAEAWP), 256MiB, page size: 2048, OOB size: 64

[    1.727799] omap2-nand: detected x8 NAND flash

[    1.732707] omap2-nand omap2-nand.0: DMA engine request failed

 

  • 0
    TI__Expert 4475 points

    Hi Oleg,

    I applied the patches in /arch/arm/boot/dts/am335x-evm.dts file and in .config files. Copy them to the sd-card and boot the systems. But when I try to insert a mtd_speedtest.ko module on the screen appears:
    [  773.093210]
    [  773.094818] =================================================
    [  773.100885] mtd_speedtest: Please specify a valid mtd-device via module parameter
    [  773.108871] mtd_speedtest: CAREFUL: This test wipes all data on the specified MTD device!
    Error: could not insert module lib/modules/3.12.10-ti2013.12.01/mtd_speedtest.ko: Invalid parameters

    I try to insert with the insmod lib/modules/3.12.10-ti2013.12.01/kernel/drivers/mtd/tests/mtd_speedtest.ko
    Please could you much more detailed explain what you did.

    BTW are you sure that you want to change the "MTD tests support (DANGEROUS) (MTD_TESTS)" options, because on config file is following warning:
    "WARNING: some of the tests will ERASE entire MTD device which they
     test. Do not use these tests unless you really know what you do."

    BR
    Ivan

  • 0 in reply to Ivan Matrakov
    TI__Expert 4475 points

    Hi Oleg,

    I have just execute the mtd_speedtest and  and test pass well. I type a log from this test:

    [  461.613399]
    [  461.615007] =================================================
    [  461.621199] mtd_speedtest: MTD device: 9
    [  461.626609] mtd_speedtest: MTD device size 257949696, eraseblock size 131072, page size 2048, count of eraseblocks 1968, pages per eraseblock 64, OOB size 64
    [  461.644432] mtd_test: scanning for bad eraseblocks
    [  461.856017] mtd_test: scanned 1968 eraseblocks, 0 are bad
    [  462.859672] mtd_speedtest: testing eraseblock write speed
    [  512.782068] mtd_speedtest: eraseblock write speed is 5046 KiB/s
    [  512.788347] mtd_speedtest: testing eraseblock read speed
    [  544.992018] mtd_speedtest: eraseblock read speed is 7823 KiB/s
    [  546.749323] mtd_speedtest: testing page write speed
    [  596.704861] mtd_speedtest: page write speed is 5043 KiB/s
    [  596.710608] mtd_speedtest: testing page read speed
    [  629.019499] mtd_speedtest: page read speed is 7798 KiB/s
    [  630.774101] mtd_speedtest: testing 2 page write speed
    [  680.711473] mtd_speedtest: 2 page write speed is 5044 KiB/s
    [  680.717402] mtd_speedtest: testing 2 page read speed
    [  712.979105] mtd_speedtest: 2 page read speed is 7809 KiB/s
    [  712.984958] mtd_speedtest: Testing erase speed
    [  714.738542] mtd_speedtest: erase speed is 144027 KiB/s
    [  714.744025] mtd_speedtest: Testing 2x multi-block erase speed
    [  715.747406] mtd_speedtest: 2x multi-block erase speed is 252408 KiB/s
    [  715.754264] mtd_speedtest: Testing 4x multi-block erase speed
    [  716.756956] mtd_speedtest: 4x multi-block erase speed is 252661 KiB/s
    [  716.763797] mtd_speedtest: Testing 8x multi-block erase speed
    [  717.768532] mtd_speedtest: 8x multi-block erase speed is 252156 KiB/s
    [  717.775388] mtd_speedtest: Testing 16x multi-block erase speed
    [  718.778581] mtd_speedtest: 16x multi-block erase speed is 252661 KiB/s
    [  718.785534] mtd_speedtest: Testing 32x multi-block erase speed
    [  719.788920] mtd_speedtest: 32x multi-block erase speed is 252408 KiB/s
    [  719.795863] mtd_speedtest: Testing 64x multi-block erase speed
    [  720.798946] mtd_speedtest: 64x multi-block erase speed is 252661 KiB/s
    [  720.805885] mtd_speedtest: finished
    [  720.809994] =================================================

    BR
    Ivan

  • 0 in reply to Ivan Matrakov
    Prodigy 50 points

    Hello Ivan,

    could you please verify if the kernel has picked up the correct dtb?

    You can query the device-tree via /proc like this:

    cat /proc/device-tree/ocp/gpmc\@50000000/nand\@0\,0/ti\,nand-xfer-type
    This should return: prefetch-dma

    I'm asking because the speeds returned from mtd_speedtest look very similar to "prefetch-polled"-Mode.

    Thanks!

    Julian