RPi4B u-boot based booting and hw.cpufreq.voltage_core and dev.cpu.0.freq use: able to use 2000 MHz
Mark Millard via freebsd-arm <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.arm |
|---|---|
| Message-ID | <[email protected]> |
I got access to a 4 GiByte RPi4B that does not have modernized
eeprom contents. With it I was able to do a u-boot based boot
of head -r365932 based on the msdosfs on a older microsd card
that had materials from 2020-Jul-13 (u-boot.bin) and 14 (RPi4B
materials). I updated EFI/BOOT/bootaa64.efi . The u-boot.bin
is from my build of sysutils/u-boot-rpi4/ (no local changes).
In this context . . .
I added over_voltage=6 and arm_freq=2000 to config.txt and it
ends up looking like:
arm_control=0x200
arm_64bit=1
dtoverlay=disable-bt
dtoverlay=mmc
device_tree_address=0x4000
kernel=u-boot.bin
armstub=armstub8-gic.bin
over_voltage=6
arm_freq=2000
Booting based on that resulted in:
dev.bcm2835_cpufreq.0.freq_settings: 2000/-1 600/-1
dev.cpu.0.freq_levels: 2000/-1 600/-1
dev.cpu.0.freq: 600
And:
# sysctl dev.cpu.0.freq=2000
dev.cpu.0.freq: 600 -> 2000
worked. (Without the over_voltage it reports 600 and then
hangs.) Having /etc/sysctl.conf list dev.cpu.0.freq=2000
works.
I'll note that the following changes resulted (-: 600 MHz
[before], +: 2000 MHz [after]) on a basically idle RPi4B:
-hw.cpufreq.temperature: 45000
+hw.cpufreq.temperature: 48000
-hw.cpufreq.voltage_core: 951250
+hw.cpufreq.voltage_core: 1006250
-hw.cpufreq.turbo: 0
+hw.cpufreq.turbo: 1
-hw.cpufreq.core_freq: 200000000
+hw.cpufreq.core_freq: 500000000
-hw.cpufreq.arm_freq: 600000000
+hw.cpufreq.arm_freq: 2000000000
-dev.cpu.0.freq: 600
+dev.cpu.0.freq: 2000
Note: over_voltage contributes to hw.cpufreq.voltage_core
and the higher figures are required to be in place before
dev.cpu.0.freq is increased --if things are to work.
Other notes about the configuration:
=> 63 62333889 mmcsd0 MBR (30G)
63 32705 - free - (16M)
32768 163840 mmcsd0s1 fat32lba [active] (80M)
196608 54525952 mmcsd0s2 freebsd (26G)
54722560 7611392 - free - (3.6G)
=> 0 54525952 mmcsd0s2 BSD (26G)
0 54525952 mmcsd0s2a freebsd-ufs (26G)
=> 40 468862048 da0 GPT (224G)
40 2008 - free - (1.0M)
2048 413138944 da0p1 freebsd-ufs (197G)
413140992 9437184 da0p2 freebsd-swap (4.5G)
422578176 204800 da0p3 ms-basic-data (100M)
422782976 46079112 - free - (22G)
Although a microsd card is involved in booting the u-boot
configuration, the USB3 SSD and the root file system used
on it are the same ones as for the rpi4-uefi-devel ACPI
based booting that I do. For the u-boot based booting,
the kernel loads from the microsd card, not USB. FreeBSD's
lkernel find the USB3 SSD materials, not u-boot or the
bootaa64.efi . There are a few other UFS files that the
very early activity use copies of that are on the microsd
card.
msdos file system:
drwxr-xr-x 25 root wheel 1024 Sep 25 22:50:25 2020 ..
-rwxr-xr-x 1 root wheel 164 Sep 25 22:50:16 2020 config.txt
drwxr-xr-x 1 root wheel 1024 Jul 14 18:43:24 2020 OVERLAYS
-rwxr-xr-x 1 root wheel 47413 Jul 14 16:01:00 2020 bcm2711-rpi-4-b.dtb
-rwxr-xr-x 1 root wheel 2277248 Jul 14 16:01:00 2020 start4.elf
-rwxr-xr-x 1 root wheel 5409 Jul 14 16:00:58 2020 fixup4.dat
-rwxr-xr-x 1 root wheel 4592 Jul 14 15:57:48 2020 Readme.md
-rwxr-xr-x 1 root wheel 514272 Jul 13 11:56:54 2020 u-boot.bin
-rwxr-xr-x 1 root wheel 5888 Jan 30 13:26:30 2020 armstub8-gic.bin
-rwxr-xr-x 1 root wheel 18693 Nov 22 09:06:44 2019 COPYING.linux
-rwxr-xr-x 1 root wheel 1594 Nov 22 09:06:44 2019 LICENCE.broadcom
drwxr-xr-x 1 root wheel 1024 Sep 27 21:05:00 2018 EFI
drwxr-xr-x 1 root wheel 2048 Dec 31 16:00:00 1979 .
The RPi4B files with Jul 14 dates were likely from the rpi4-uefi-devel
v1.17 release. They are not from a /usr/ports/sysutils/rpi-firmware/
build. (I removed the v1.17 RPI_EFI.fd while setting this up.)
# ls -laTt OVERLAYS/
total 9
drwxr-xr-x 1 root wheel 1024 Jul 14 18:43:24 2020 .
-rwxr-xr-x 1 root wheel 1073 Jul 14 18:43:14 2020 disable-bt.dtbo
-rwxr-xr-x 1 root wheel 1819 Jul 14 16:01:00 2020 miniuart-bt.dtbo
-rwxr-xr-x 1 root wheel 1221 Nov 22 09:06:44 2019 mmc.dtbo
drwxr-xr-x 1 root wheel 2048 Dec 31 16:00:00 1979 ..
(Looks like I still have a /usr/ports/sysutils/rpi-firmware/ based
mmc.dtbo . Likely that vintage is not a requirement and matching
close to the July material dates would be okay.)
I'll note that I got disable-bt.dtbo from the raspberry pi github
areas, deliberately matching timeframes. rpi4-uefi-devel does not
include it, nor mmc.dtbo.
# ls -laTt EFI/BOOT/bootaa64.efi
-rwxr-xr-x 1 root wheel 705776 Sep 20 20:41:44 2020 EFI/BOOT/bootaa64.efi
bootaa64.efi I updated ( copy of loader.efi ).
As for UFS on the microsd card:
# ls -laT
total 32
drwxr-xr-x 6 root wheel 512 Sep 25 21:17:39 2020 .
drwxr-xr-x 25 root wheel 1024 Sep 25 22:50:25 2020 ..
drwxrwxr-x 2 root operator 512 Jul 19 16:35:45 2020 .snap
-r--r--r-- 1 root wheel 6170 Feb 1 04:48:34 2020 COPYRIGHT
drwxr-xr-x 24 root wheel 1536 Sep 25 22:06:40 2020 boot
drwxr-xr-x 2 root wheel 512 Sep 25 21:38:41 2020 etc
drwx------ 2 root wheel 512 Nov 27 09:46:08 2019 lost+found
boot is a complete copy of the head -r365932 one on the USB3 SSD's
ufs file system ( other than managing boot/entropy ). I'll not list
its contents here.
# ls -ldT etc/*
-rw-r--r-- 1 root wheel 236 Sep 25 21:50:27 2020 etc/fstab
-rw-r--r-- 1 root wheel 37 Dec 31 16:00:18 2009 etc/hostid
Both these match the USB3 SSD's /etc/ files by content.
# more etc/fstab
/dev/gpt/RPi4Broot / ufs rw,noatime 1 1
#
/dev/label/RPi4root /microsd_ufs ufs rw,noatime,noauto 1 1
#
/dev/gpt/RPi4Bswap none swap sw 0 0
#
/dev/msdosfs/RPI4BEFI /usb_efi msdosfs rw,noatime 0 0
/dev/label/RPi4boot /microsd_efi msdosfs rw,noatime,noauto 0 0
I use various types of labels to identify partitions and/or
file systems (gpt, glabel label, msdosfs). The /dev/gpt/ ones
and the /dev/msdosfs/ one are on the USB3 SSD. The /deve/label/
ones are on the microsd card.
I avoided using /boot/efi notation, making usb [for uefi/ACPI)
vs. microsd (for u-boot) explicit instead and allowing both
to be mounted at the same time in their normal places (when
booted via u-boot).
===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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