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/00d568a3-0cb5-450c-86ab-3e5a12fd62e1n%40googlegroups.com.
