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Hexxeh / rpi-firmware

Firmware files for the Raspberry Pi
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Kernel: making uas module built-in #181

Open vpelletier opened 6 years ago

vpelletier commented 6 years ago

Being tired of burning through micro µSD cards and wishing to keep my pi stand-alone, I purchased a UAS-enabled USB enclosure and a (cheap) SSD, and chain-boot on it (booloader & kernel are still on sdcard fat partition, with root=PARTUUID=<an ssd partition>). It boots fine, but kernel uses USB mass-storage module.

Mass storage does not give access to some features, like trim. UAS (USB-attached SCSI) protocol, on the other hand, does give access to trim, so I would like to be able to boot from it. Would it be possible to build kernel images with CONFIG_USB_UAS=Y ? (building as a module would be no good without and initrd)

pelwell commented 6 years ago

CONFIG_USB_UAS=m creates a not insignificant (but not heavyweight) 29KB module. I'm not keen to add ~29KB to everybody's kernel so you can trim your SSD using a stock RPi kernel. If you don't think the impact would be so great, build the kernel with and without this option and report the output of free in both.

satmandu commented 4 years ago

Changing one's setup to use an initramfs doesn't seem to be too hard: https://raspberrypi.stackexchange.com/a/103849