Hi,
I forgot attaching kernel log.
I don't know if I can add it by replying to the comment, but I will
challenge it.
I thought that the SDHC/MMC are type of media, and "high speed" indicates
4-bit mode.
[ 1.086202] mmc0: new high speed SDHC card at address 0001
[ 1.091531] mmcblk0: mmc0:0001 ASTC 29.0 GiB
[ 1.118517] mmc1: new high speed MMC card at address 0001
[ 1.123897] mmcblk1: mmc1:0001 M62704 3.56 GiB
regards,
2021年2月23日火曜日 11:20:26 UTC+9 ha ppay:
> Hi Jeff,
> Thank you for your reply.
> >Hi when you say you're collecting information for faster boot times, can
> you tell us more about what OS and FS you're running?
> Functions I require are emmc, i2c, uart, gpio, wlan, adc.
> ===results of
> Version.sh================================================================================================
> git:/opt/scripts/:[b39ec679648a6be8f25f48bd1c9784c1fc5a0c46]
> eeprom:[A335BNLTBWA52010BBWG0277]
> model:[TI_AM335x_BeagleBone_Black_Wireless]
> dogtag:[BeagleBoard.org Debian Buster IoT Image 2020-04-06]
> bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot
> 2019.04-00002-g07d5700e21]:[location: dd MBR]
> UBOOT: Booted Device-Tree:[am335x-boneblack-uboot-univ.dts]
> UBOOT: Loaded Overlay:[AM335X-PRU-RPROC-4-19-TI-00A0]
> UBOOT: Loaded Overlay:[BB-ADC-00A0]
> UBOOT: Loaded Overlay:[BB-BBBW-WL1835-00A0]
> UBOOT: Loaded Overlay:[BB-BONE-eMMC1-01-00A0]
> kernel:[4.19.94-ti-r42]
> nodejs:[v10.15.2]
> /boot/uEnv.txt Settings:
> uboot_overlay_options:[enable_uboot_overlays=1]
> uboot_overlay_options:[disable_uboot_overlay_video=1]
> uboot_overlay_options:[disable_uboot_overlay_audio=1]
>
> uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-19-TI-00A0.dtbo]
> uboot_overlay_options:[enable_uboot_cape_universal=1]
> pkg check: to individually upgrade run: [sudo apt install --only-upgrade
> <pkg>]
> pkg:[bb-cape-overlays]:[4.14.20200403.0-0rcnee0~buster+20200403]
> pkg:[bb-wl18xx-firmware]:[1.20200322.0-0rcnee0~buster+20200322]
> pkg:[kmod]:[26-1]
> pkg:[librobotcontrol]:[1.0.4-git20190227.1-0rcnee0~buster+20190327]
> pkg:[firmware-ti-connectivity]:[20190717-2rcnee1~buster+20200305]
> groups:[debian : debian adm kmem dialout cdrom floppy audio dip video
> plugdev users systemd-journal bluetooth netdev i2c gpio pwm eqep remoteproc
> admin spi iio docker tisdk weston-launch xenomai cloud9ide]
> cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1
> root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M
> net.ifnames=0 lpj=1990656 rng_core.default_quality=100 quiet]
> dmesg | grep remote
> [ 19.613520] remoteproc remoteproc0: 4a334000.pru is available
> [ 19.625567] remoteproc remoteproc1: 4a338000.pru is available
> [ 85.818817] remoteproc remoteproc2: wkup_m3 is available
> [ 85.828262] remoteproc remoteproc2: powering up wkup_m3
> [ 85.828300] remoteproc remoteproc2: Booting fw image
> am335x-pm-firmware.elf, size 217168
> [ 85.828581] remoteproc remoteproc2: remote processor wkup_m3 is now up
> dmesg | grep pru
> [ 19.613520] remoteproc remoteproc0: 4a334000.pru is available
> [ 19.613727] pru-rproc 4a334000.pru: PRU rproc node pru@4a334000 probed
> successfully
> [ 19.625567] remoteproc remoteproc1: 4a338000.pru is available
> [ 19.625765] pru-rproc 4a338000.pru: PRU rproc node pru@4a338000 probed
> successfully
> dmesg | grep pinctrl-single
> [ 0.930015] pinctrl-single 44e10800.pinmux: 142 pins, size 568
> dmesg | grep gpio-of-helper
> [ 0.943259] gpio-of-helper ocp:cape-universal: ready
> lsusb
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> END
>
> ===================================================================================================================
>
> >Why are you focusing solely on speeding up the hardware as opposed to
> ways to make u-boot and the kernel to boot faster, for instance?
>
> I use BBBW as an evaluation board for am3351.
> Among them, I'm simply looking for a faster boot time. Setting up the
> kernel and uboot was a bit difficult for me now.
> While reading the am335x TRM, I found the MMC transfer rate setting in the
> MMCHS description.
> For confirmation, I wrote the same image to the SD card and eMMC and
> compared the BOOT time, and the result was that eMMC was only a few seconds
> faster.
> If the MMC was in 8-bit mode, I thought it would be faster, and I wondered
> if both were running in 4-bit mode.
> When I added initcall_debug to the kernel command line and booted from the
> SD card, I got the following log.
> I thought this log had the transfer rate set to high speed (4-bit Mode)
> for both SDHC and MMC.
> 2021年2月23日火曜日 0:42:12 UTC+9 RobertCNelson:
>
>> On Thu, Feb 18, 2021 at 1:10 AM ha ppay <[email protected]> wrote:
>> >
>> >
>> > Hi Everyone.
>> > I'm collecting information to get even faster boot times,
>> > I have 2 questions.
>> > It is written that it is possible to boot from MMC (8bit mode) (18.1.1
>> MMCHS Features) using MMC mode with TRM of am335x.
>> > - Clock support
>> > -96-MHz functional clock source input
>> > -up to 384Mbit/sec (48MByte/sec) in MMC mode 8-bit data transfer
>> > -up to 192Mbit/sec (24MByte/sec) in High-Speed SD mode 4-bit data
>> transfer
>> > -up to 24Mbit/sec (3MByte/sec) in Default SD mode 1-bit data transfer
>> >
>> > Also, the SD_CON register DW8 Field has a flag for it.
>> > I expect this setting to start up much faster.
>> > In BBB, how do I set it to 8bit mode and how do I set the frequency to
>> 384Mbit / sec (is it mmc_clk/clock-div in Devicetree?)?
>>
>> It's already in 8-bit mode..
>>
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/am335x-boneblack-common.dtsi#n23
>>
>>
>> &mmc2 {
>> vmmc-supply = <&vmmcsd_fixed>;
>> pinctrl-names = "default";
>> pinctrl-0 = <&emmc_pins>;
>> bus-width = <8>;
>> status = "okay";
>> non-removable;
>> };
>>
>> Regards,
>>
>> --
>> Robert Nelson
>> https://rcn-ee.com/
>>
>
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/beagleboard/c5367a85-5d49-4114-b3e7-c566a5a1c2d1n%40googlegroups.com.
