110 lines
2.2 KiB
Markdown
110 lines
2.2 KiB
Markdown
#### kernel config
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**CONFIG_CPU_SPECTRE ?**
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----
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#### [ TIME ] Timed out waiting for device dev-ttyS0.device. [DEPEND] Dependency failed for Serial Getty on ttyS0.
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A start job is running for dev-ttyS0.device
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```
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[ TIME ] Timed out waiting for device dev-ttyS0.device.
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[DEPEND] Dependency failed for Serial Getty on ttyS0.
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```
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/lib/systemd/system/serial-getty@.service
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## Steps
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#### 1. First copy the template:
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```
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# cp /usr/lib/systemd/system/serial-getty@.service /etc/systemd/system/serial-getty@ttyS0.service
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```
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#### 2. Then edit the file and modify the agetty line:
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```
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[Service]
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ExecStart=-/sbin/agetty --keep-baud 115200,38400,9600 %I $TERM <-- Change this parameter
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Type=idle
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```
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#### 3. Create a symlink:
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```
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# ln -s /etc/systemd/system/serial-getty@ttyS0.service /etc/systemd/system/getty.target.wants/
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```
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#### 4. Reload the daemon and start the service:
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```
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# systemctl daemon-reload
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# systemctl start serial-getty@ttyS0.service
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# systemctl enable serial-getty@ttyS0.service
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```
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----
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## NoTe
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#### for docker (riscv)
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```
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apt install -y conntrack ebtables ethtool iptables libip6tc2 libnetfilter-conntrack3 libnfnetlink0 libyajl-dev libyajl2 socat
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maybe: update-alternatives --set iptables /usr/sbin/iptables-legacy
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```
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#### Debian ports for RISCV repo
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```
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deb http://ftp.ports.debian.org/debian-ports/ sid main
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deb http://ftp.ports.debian.org/debian-ports/ unreleased main
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```
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```
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deb https://mirrors.cloud.tencent.com/debian-ports/ sid main
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deb https://mirrors.cloud.tencent.com/debian-ports/ unreleased main
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```
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```
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deb https://mirrors.aliyun.com/debian-ports/ sid main
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deb https://mirrors.aliyun.com/debian-ports/ unreleased main
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#deb https://mirrors.aliyun.com/thead/debian-riscv64/ sid main
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for thead need:
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apt install gnupg2
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wget https://mirrors.aliyun.com/thead/thead-keys/thead-repo.gpg
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apt-key add ./thead-repo.gpg
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rm -rf ./thead-repo.gpg
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check:
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apt-key list | grep 'F164 B941 4332 FC54'
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```
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#### vscode linux arm64
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```
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https://aka.ms/linux-arm64-deb
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```
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----
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#### unixbench
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```
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UB_GCC_OPTIONS='-O3 -fomit-frame-pointer -fforce-addr -ffast-math -Wall -march=armv8-a -mtune=cortex-a72'
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make
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```
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- stop system service not used
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- Run script in /dev/shm
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```
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cat /sys/block/sda/queue/scheduler
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echo xxx > /sys/block/sda/queue/scheduler
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```
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