this post was submitted on 10 Jun 2024
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They really, really, should be doing A/B systems. Or just have an absolutely minimum loader that can load from EPROM/flash or USB so when the system storage gets messed up, you can still launch the updater from USB. That bios loader doesn't need to know more than how to talk to storage and shovel bytes to the CPU, maybe blink a LED, it's simple enough to be able to be actual ROM, never needing to be updated.
Wait, no: SD cards can talk SPI... it's not going to be fast but it's only a few megs anyway. The EPROM or Flash you're using probably speaks SPI, already. You could literally make a system which can load the BIOS from SD card for the cost of a card cage and maybe a jumper. You could have gigabytes of bios storage for three bucks by using off the shelf cheap SD cards, forget A/B storage you could do the whole bloody alphabet and people could replace the thing easily.
Here's some extra fun: there's a decent chance that you only need a cable with JST or DuPont connectors. I've seen a fair number of laptop motherboards with unused SPI headers/connectors just hanging out. My understanding being that they're for possible accessories or, literally for flashing/debugging the bios.