fsl_rio_config_read(9)

📦 version 7.3.1, in nixpkgs unstable

💅 fsl_rio_config_read — a Kernel API Manual moment (section 9, bestie)

okay so this one lives in the kernel API manual, section 9, and it's literally called fsl_rio_config_read. buckle up 🎀

✨ NAME ✨

fsl_rio_config_read — generate a MPC85xx read maintenance transaction. that's it, that's the whole vibe 🦋

🌸 SYNOPSIS 🌸

int fsl_rio_config_read (struct rio_mport *mport , int index , u16
destid , u8 hopcount , u32 offset , int len , u32 *val );

yes bestie, that's a whole lot of parameters. count them. we'll get to each one, no cap 💅

💖 ARGUMENTS 💖

  • mport — RapidIO master port info 👑 like, the port that's doing the main character work here
  • index — ID of RapdiIO interface (spelling is straight from the source, don't come for me 🙈)
  • destid — destination ID of the transaction 🎯 where this thing is headed
  • hopcount — number of hops to the target device 🦋 how many little leaps before you get there
  • offset — offset into configuration space 📍
  • len — length (in bytes) of the maintenance transaction 📏
  • val — location to be read into 🫶 the lil spot where the result lands

🔥 DESCRIPTION 🔥

so what does it actually do? it generates a MPC85xx read maintenance transaction ✨ periodt.

returns 0 on success or -EINVAL on failure. that's the whole deal, bestie — 0 = slay, -EINVAL = not slay 😭

🌈 SEE ALSO 🌈

the whole friend group, fr fr 💜

🧚 quick vibe check: -EINVAL is the failure return, so don't go treating it like success. the manpage said failure, and we respect the manpage 💀

and that's the page!! brought to you from ./arch/powerpc/sysdev, dated October 2026, in the Kernel API Manual — mwah, go read the other fsl_* ones now 💅💖

📦 where this page comes from