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c4f33e1c9d
- 99-retro-usb-permissions.rules renamed to 90-retro-usb-permissions.rules
- 91-retro-usb-latency.rules: udev rule to enforce low latency for FDTI USB UART
- 92-retro-usb-persistent.rules: udev rule for persistent device names
- Note:
- for all FTDI USB-UART it is essential to set them to `low latency` mode.
That was default for linux kernels 2.6.32 to 4.4.52. Since about March
2017 one gets kernels with 16 ms default latency again, thanks to
kernel patch 9589541. For newer systems it is essential to install the
udev rule which automatically sets low latency.
31 lines
998 B
Markdown
31 lines
998 B
Markdown
This directory contains udev rules which ensure that the Cypress FX2 on
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- Digilent Nexys2
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- Digilent Nexys3
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- Digilent Atlys
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is read/write accessible for user land processes, either in
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- original power on state _(thus Digilent VID/PID)_
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- after custom firmware is loaded _(thus VOTI VID/PID)_
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> **The rules assume that eligible user accounts are in group `plugdev`.
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> Check with the `groups` command whether your account is in group `plugdev`,
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> in not, add this group to your accounts groups list.**
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To setup udev rules do
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```bash
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sudo cp -a 90-retro-usb-permissions.rules /etc/udev/rules.d/
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sudo chown root:root /etc/udev/rules.d/90-retro-usb-permissions.rules
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dir /etc/udev/rules.d/
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sudo udevadm control --reload-rules
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```
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to verify whether usb device was really put into group `plugdev`
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```bash
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lsusb
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# --> look for bus/dev of interest
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find /dev/bus/usb -type c | sort| xargs ls -l
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# --> check whether bus/dev of interest is in group plugdev
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```
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