Spectre V1 & V2 and Variant 4 Speculative Store Bypass
CVE-2018-3640 CVE-2018-3639

RPi pinout

2x USB2.0 connected to VL805 (wire savings - USB3 wires not connected)
2x USB3.1 Gen 1 5Gbit - VL805 connected via PCIe 2.0 1x (5Gbit)
1x Gigabit Ethernet connected via PCIe 1.0 1x (2Gbit)
VideoCore VI running on ThreadX
Power approx 3-8Watts
iperf3 949Mbit/s

912 Mbit/s = 114 MB/s read and write
ASM1352R FW:B5_20_60 UASP and vl805_fw_0137ab.bin (raw read/write 358/159 MB/s)

Raspbian Buster Lite

ChaCha20-Poly1305 is fastest so it can be preferred (approx. 323 MB/s 2GHz)
AES-128-CBC max. 113 MB/s

ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

arm_freq=1200
arm_freq_min=266
disable_splash=1
gpu_freq=100
gpu_freq_min=100
v3d_freq=100
gpu_mem=64
over_voltage=-1
temp_limit=80
arm_64bit=1

Add some fan!

arm_freq=1750
over_voltage=2
-- or --
arm_freq=2000
over_voltage=5

Insert empty file named “ssh” in /boot dir
Insert file named “userconf” in /boot dir with user:encryptedpass

echo 'mypassword' | openssl passwd -6 -stdin

Recommended SD card with MLC (Samsung Pro, SanDisk High Endurance, etc)

defaults,noatime,nodiratime,commit=1800

/etc/fstab (move most active locations to RAM)

tmpfs /tmp                      tmpfs    defaults,noatime,nosuid,size=100m   0 0
tmpfs /var/tmp                  tmpfs    defaults,noatime,nosuid,size=30m    0 0
tmpfs /var/log                  tmpfs    defaults,noatime,nosuid,mode=0755,size=100m  0 0
tmpfs /var/cache/minidlna       tmpfs    defaults,noatime,nosuid,size=128m    0 0
tmpfs /var/spool/mqueue         tmpfs    defaults,noatime,nosuid,mode=0700,gid=12,size=30m 0 0
tmpfs /var/lib/logrotate        tmpfs    defaults,noatime,nosuid,mode=0755,size=10m 0 0
tmpfs /var/lib/samba            tmpfs    defaults,noatime,nosuid,mode=0755,size=10m 0 0
tmpfs /var/lib/nginx            tmpfs    defaults,noatime,nosuid,mode=0755,size=100m 0 0
tmpfs /var/lib/php/sessions     tmpfs    defaults,noatime,nosuid,mode=1733,size=10m 0 0
tmpfs /var/lib/systemd/timers   tmpfs    defaults,noatime,nosuid,mode=0755,size=1m 0 0
tmpfs /var/lib/systemd/timesync tmpfs    defaults,noatime,nosuid,mode=0755,uid=100,gid=102,size=1m 0 0

create file /usr/lib/tmpfiles.d/ramdisk.conf

d /var/log/samba 0755 - - -
d /var/log/exim4 0755 110 117 -
d /var/lib/samba/private 0755 - - -
d /var/lib/samba/usershares 1700 - - -
d /var/log/nginx 0755 - - -
d /var/log/mysql 0755 112 119 -

sudo apt-get remove fake-hwclock
sudo rm /etc/cron.hourly/fake-hwclock
sudo update-rc.d -f fake-hwclock remove
sudo rm /etc/init.d/fake-hwclock
sudo rm /etc/fake-hwclock.dat

sudo ionice -c 3 fstrim -v /

If installed disable smartd

sudo systemctl disable smartmontools

Info about SD card
/sys/bus/mmc/devices/mmc0:0002

vcgencmd measure_temp
vcgencmd measure_temp | awk '{ print substr($1,6,length($1)-9) }'

vcgencmd get_mem gpu

vcgencmd measure_clock xxx

xxx = arm, core, h264, isp, v3d, uart, pwm, emmc, pixel, vec, hdmi, dpi

vcgencmd measure_volts xxx

xxx = core, sdram_c, sdram_i, sdram_p

vcgencmd bootloader_version

vcgencmd get_config int

timedatectl status

More on SAMBA article for CentOS / RedHat

ffmpeg -vcodec h264_mmal -i input.mkv -s 1920x1080 -c:v h264_omx -b:v 6000k output.mkv

h264 accelerated decode and encode sample
hevc_v4l2m2m

##turn on/off wifi

dtoverlay=disable-wifi

/usr/bin/tvservice -o

Status

/usr/bin/tvservice -s

fs.inotify.max_user_watches=524288

Best stable settings are

• autosuspend=-1
• hdparm
• wake script

Prevent external USB from 20s sleep by adding this into /boot/cmdline.txt

usbcore.autosuspend=3600

sudo hdparm -S 241 /dev/sda

Download compiled deb package

https://janforman.org/files/Linux/hd-idle_1.05_armhf.deb

OR

sudo apt-get install build-essential fakeroot debhelper -y
wget https://janforman.org/files/Linux/hd-idle-1.05.tgz
tar -xvf hd-idle-1.05.tgz
cd hd-idle
dpkg-buildpackage -rfakeroot -uc -us
sudo dpkg -i ../hd-idle_*.deb

sudo nano /etc/default/hd-idle

HD_IDLE_OPTS="-i 0 -a sda -i 3600 -a sdb -i 3600"

Insert device ids into /boot/cmdline.txt

usb-storage.quirks=152d:8561:u

Run this in background

while [ 1 ]
do
hdparm -C /dev/sda >/dev/null
sleep 120
done

sudo apt install mc samba minidlna ffmpeg hostapd bridge-utils smartmontools

sudo nano /etc/hostapd/hostapd.conf

interface=wlan0
driver=nl80211
ssid=janforman.com
hw_mode=a
channel=40
wmm_enabled=0
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=AardvarkBadgerHedgehog
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

sudo mount -t fs_type -o rw,lazytime,noatime,nodiratime,commit=600 device /path/to/dest/fs

sudo systemctl disable dphys-swapfile.service

mkfs.ext4 -b 4096 -i 131072 -I 128 /dev/sda1
tune2fs -i0 -c -1 /dev/sda1
tune2fs -o journal_data_writeback /dev/sda1
tune2fs -m 0 /dev/sda1

mkfs.f2fs -s64 -o0 -t0 -a0 /dev/sda1
mount -t f2fs -onoinline_data,noatime,flush_merge,no_heap,extent_cache,noacl,active_logs=2 /dev/sda1 /mnt

sudo apt-get update; sudo apt-get install --reinstall raspberrypi-bootloader raspberrypi-kernel

show

rpi-eeprom-config

edit

sudo -E rpi-eeprom-config --edit

POWER_OFF_ON_HALT=1

DISABLE_HDMI=1