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| somlo | _florent_: with the latest everything, I can boot from spi-sdcard; With "regular" litesdcard, I'm getting the progress bar to complete (slowly), then things hang after "Liftoff!" | 13:18 |
|---|---|---|
| somlo | so I'm wondering if the boot.bin blob gets somehow corrupted in transit | 13:18 |
| _florent_ | somlo: i also need to do more tests with litesdcard, that's indeed probably broken currently | 13:28 |
| _florent_ | somlo: but i haven't speed too much time on it since i'm also thinking about revisiting litesdcard a bit to simplify it, make it more software assisted and only do the critical things (blocks transfers) in the gateware | 13:30 |
| somlo | ok, I won't worry too much about litesdcard for now, then :) | 13:48 |
| _florent_ | somlo: the current issue with LiteSDCard is that the clocking is complicated and it use a lot of resource (due to the way the control interface is done) | 13:53 |
| _florent_ | somlo: initially LiteSDCard was used in standalone to write/read streams of blocks, so decided of the current architecture | 13:57 |
| _florent_ | somlo: but while working on the SPI mode recently, i realized we should probably simplify LiteSDCard to use less resource and have more in common with the SPI mode | 13:58 |
| _florent_ | somlo: but we'll see... | 13:58 |
| _florent_ | somlo: have you been able to do some speedtests with the SPI SDCard with Linux? | 13:59 |
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| somlo | _florent_: I did some very informal measurement of how long it took to transfer a file to/from the card from within linux | 14:12 |
| somlo | I don't remember if I wrote it down at the time, should be simple to recreate | 14:13 |
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| _florent_ | somlo: i'm asking this just to be able to compare with the speed with the bios | 14:29 |
| somlo | _florent_: I'm rebuilding a bitstream for the nexys4ddr with spi-mode sdcard support (already have a kernel and bbl that's good for it). I'll re-run the tests and post here in 20-30 minutes | 14:32 |
| _florent_ | somlo: if that's low compare to the speed with the bios (> 1MB/s on reads) we could try to see how block accesses are done with the driver and see if we can optimize it. | 14:32 |
| somlo | _florent_: took me about 9m to `cat` a 12.5MB file to /dev/null | 14:53 |
| somlo | that's read | 14:53 |
| somlo | I can try to figure out a way to measure writes as well, but it'll probably have to include the time `umount` takes to flush things to actual sdcard once the file creation is reported as "complete" | 14:54 |
| _florent_ | somlo: that's slow... | 14:54 |
| somlo | yeah, much slower than the bios | 14:54 |
| _florent_ | somlo: with the bios it would be 9s :) | 14:55 |
| somlo | I know, I booted from it :) | 14:55 |
| _florent_ | somlo: can you provide a link to the driver? | 14:56 |
| futarisIRCcloud | Where's the linux driver? | 14:56 |
| somlo | https://github.com/litex-hub/linux/blob/litex-rocket-rebase/drivers/spi/spi-litespi.c | 14:57 |
| tpb | Title: linux/spi-litespi.c at litex-rocket-rebase · litex-hub/linux · GitHub (at github.com) | 14:57 |
| somlo | with the remark that mmc_spi (which runs unmodified from its upstream original on top of litespi) forces transfers to 8bpw | 15:00 |
| _florent_ | doing 32bpw improves speed a bit, but not that much | 15:11 |
| somlo | _florent_: you mean in the bios? Because in linux doing anything besides 8 simply doesn't work in my experience | 15:17 |
| _florent_ | somlo: yes i switched to 32 for block xfers in the bios: https://github.com/enjoy-digital/litex/blob/master/litex/soc/software/liblitesdcard/spisdcard.c#L146 | 15:20 |
| tpb | Title: litex/spisdcard.c at master · enjoy-digital/litex · GitHub (at github.com) | 15:20 |
| _florent_ | somlo: it's a bit better (haven't measured) but not by a 60x ratio, it's more 20/30% | 15:21 |
| _florent_ | somlo: can you share the dts you are using for the mmc_spi? | 15:26 |
| somlo | https://github.com/gsomlo/riscv-pk/blob/gls-litex-devel/machine/litex_rocket.dts | 15:28 |
| tpb | Title: riscv-pk/litex_rocket.dts at gls-litex-devel · gsomlo/riscv-pk · GitHub (at github.com) | 15:28 |
| _florent_ | thanks | 15:32 |
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