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The amazing part of this hack is using the SD card as main memory. And booting to a shell in 15 minutes blows the doors off the project that started it all.
It uses 230 1k entries for the cache, https://github.com/tvlad1234/pico-rv32ima/blob/main/pico-rv3...
It looks like it also writes 1k during each block flush. This will definitely put some pressure on the wear leveling algo on the sdcard. :) I am a big fan of this sdcard hack, I wonder what the illogical conclusion is? SDMD RAID?
While it might not make it faster, adding 64Mbit of PSRAM to the other SPI port would make the sdcard live longer.
https://www.sramsun.com/list-354-1.html https://www.issi.com/us/product-cellular-ram.shtml
The Dmitry comments here, https://hackaday.com/2023/03/19/rp2040-runs-linux-through-ri... and has much better boot numbers for a later project.
https://dmitry.gr/?r=05.Projects&proj=07.%20Linux%20on%208bi...
Previous discussions https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
The amazing part of this hack is using the SD card as main memory. And booting to a shell in 15 minutes blows the doors off the project that started it all.
It uses 230 1k entries for the cache, https://github.com/tvlad1234/pico-rv32ima/blob/main/pico-rv3...
It looks like it also writes 1k during each block flush. This will definitely put some pressure on the wear leveling algo on the sdcard. :) I am a big fan of this sdcard hack, I wonder what the illogical conclusion is? SDMD RAID?
While it might not make it faster, adding 64Mbit of PSRAM to the other SPI port would make the sdcard live longer.
https://www.sramsun.com/list-354-1.html https://www.issi.com/us/product-cellular-ram.shtml
The Dmitry comments here, https://hackaday.com/2023/03/19/rp2040-runs-linux-through-ri... and has much better boot numbers for a later project.
https://dmitry.gr/?r=05.Projects&proj=07.%20Linux%20on%208bi...
Previous discussions https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
Pimoroni's "Picosystem" clocks the RP2040 at 250Mhz, has 16MB of working SPI flash including XiP and powers an IPS display:
https://github.com/pimoroni/picosystem (see the note next to the no_overclock compile flag)