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Resizeable Bar Support on the Raspberry Pi

https://www.jeffgeerling.com/blog/2025/resizeable-bar-support-on-raspberry-pi
36•speckx•1w ago

Comments

monocasa•1h ago
> That also led me to research why a card with only 12GB of VRAM is requesting a 16GB BAR, and as far as I can tell, it has something to do with potential uses like SR-IOV where multiple VMs could access a single device, thus requiring more BAR space for the physical device being shared... BAR is still a little bit of a mystery to me.

Lengths of BARs have to be powers of two.

tetris11•1h ago
I'm always fascinated by hobbyist's storage compartments. Some of the labels of the boxes in the background:

    - "Broken and Delidded Pis"
    - "Non-PI ARM SBCs"
    - "-ers"
    - "Pico and Arduino Microcontrollers"
    - "Breadboards" / "Electric Doodads" /
      "Pepp(?) boards"
    - "M.2 / NVMe"
    - "Blades" / "Home Lab / Soquartz"
    - "Small Windows PCS"
jasonjayr•1h ago
Jeff is a bit more than a hobbyist, between him & his father, they are rather accomplished professional radio + electric engineers.
noelwelsh•49m ago
I think of this as a Midwestern thing, where land is cheap and one can afford to devote a lot of space to hobbies. It seems to be the same thing in fabric arts, where people will have sewing rooms larger than the footprint of many UK houses. I could be totally be off base here. Maybe some actual Midwesterners can weigh in.
justin66•40m ago
It's all true, when I moved to the west coast from the midwest I was struck by the way everyone just piled their possessions into a heap in the middle of their workspace rather than placing them in labeled containers. At times the heaps reach the ceiling.
ssl-3•17m ago
Small-town midwesterner here.

There's some truth to what you're saying. Even the smallest apartment I've ever had was big enough to dedicate space to some serious hobbies, and it was (at that time) very inexpensive to rent compared a much smaller place in a more-dense area.

My lifestyle isn't very compact because it has never needed to be compact. Compactness isn't a common expectation 'round these parts. I have space to keep collections of stuff that I find interesting, and to make use of it.

There's tradeoffs to this lifestyle, though. The corner store is only a short walk away, but it mostly just sells beer, soda, and smokes. There's no walking to get something like groceries, or a new shirt (or a used shirt, for that matter). There isn't much for local entertainment. It's 15 miles to the next-largest city, and there's zero public transportation aside from the buses that get kids to/from school.

(It's hard to imagine that there aren't areas of the UK that are of similar form, though, with roomy housing, space for things, and with very limited services and/or options for commerce nearby.)

eqvinox•58m ago
> Resizeable Bar Support on the Raspberry Pi

Why'd the capitalisation of BAR get lost between the article and here? It's a little triggering.

Other than that, nice to see, a lot of ARM SoCs & SBCs have asininely small PCIe memory map sizes. Looking at you, RK3399, what was it, 64MB? Not even enough for some NICs.

monocasa•44m ago
That's an hn title munging things I think.
throw74845858•43m ago
I am still waiting for Pi5 to correctly support USBC power delivery spec. 5.1 Volts at 5 amps is a dirty hack and fire hazard, not consumer electronics!

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Resizeable Bar Support on the Raspberry Pi

https://www.jeffgeerling.com/blog/2025/resizeable-bar-support-on-raspberry-pi
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