CAS(4)

📦 version 15.1, in freebsd 14.5, freebsd 15.1

✨ NAME ✨

cas(4) — the Sun Cassini/Cassini+ and National Semiconductor DP83065 Saturn Gigabit Ethernet driver, coming at you from the Kernel Interfaces Manual. Yes bestie, manual name folded in near the top, we’re so back 💅.

⚡ SYNOPSIS ⚡

Wanna compile this driver into the kernel? Put these exact lines into your kernel configuration file:

device miibus
device cas

Alternatively, to load the driver as a module at boot time, put this exact line in loader.conf(5):

if_cas_load="YES"

🌸 DESCRIPTION 🌸

The cas driver provides support for the Sun Cassini/Cassini+ and National Semiconductor DP83065 Saturn Gigabit Ethernet controllers. Main character hardware, honestly 🦋.

All controllers supported by the cas driver have TCP/UDP checksum offload capability for both receive and transmit, support for the reception and transmission of extended frames for vlan(4), and an interrupt coalescing/moderation mechanism as well as a 512-bit multicast hash filter. That’s a whole lot of slay in one driver ✨.

The cas driver also supports Jumbo Frames (up to 9022 bytes), which can be configured via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit Jumbo Frames. Big frames, big energy 🔥.

🧚 HARDWARE 🧚

The chips supported by the cas driver are:

  • National Semiconductor DP83065 Saturn Gigabit Ethernet
  • Sun Cassini Gigabit Ethernet
  • Sun Cassini+ Gigabit Ethernet

The following add-on cards are known to work with the cas driver at this time:

  • Sun GigaSwift Ethernet 1.0 MMF (Cassini Kuheen) (part no. 501-5524)
  • Sun GigaSwift Ethernet 1.0 UTP (Cassini) (part no. 501-5902)
  • Sun GigaSwift Ethernet UTP (GCS) (part no. 501-6719)
  • Sun Quad GigaSwift Ethernet UTP (QGE) (part no. 501-6522)
  • Sun Quad GigaSwift Ethernet PCI-X (QGE-X) (part no. 501-6738)

🦋 SEE ALSO 🦋

Go read the friend group, bestie 💖.

🎀 HISTORY 🎀

The cas device driver appeared in FreeBSD 8.0 and FreeBSD 7.3. It is named after the cas driver which first appeared in OpenBSD 4.1 and supports the same set of controllers but is otherwise unrelated. History is giving lore, ngl 📜.

👑 AUTHORS 👑

The cas driver was written by Marius Strobl <marius@FreeBSD.org> based on the gem(4) driver. King behavior 👑.

okay that’s the whole CAS(4) page, bestie — source/version: Debian, dated April 18, 2023. mwah 💋

📦 where this page comes from