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| mescobar | somlo yeah I would like the compiled app to be loaded over serial | 02:45 |
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| mescobar | I'm assuming that including object file within the file system is the only way to go | 02:46 |
| mescobar | I don't think gcc is included with the linux kernel, right? | 02:46 |
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| keesj | wow.. it won't take long before the rootfs will be mounted over NFS | 05:44 |
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| daveshah | I did actually have an NFS rootfs working with litex linux | 07:12 |
| daveshah | Was very useful for userspace debugging, although liteeth is pretty slow | 07:12 |
| daveshah | In any case the place to put new userspace programs is in buildroot, which is where rootfs.cpio comes from | 07:13 |
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| keesj | I done such setup many times but every time it is a bit of work (again) also (when having a u-boot bootloader) Downloading linux/rootfs over tftp can also be nice | 08:05 |
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| somlo | mescobar: ok, so there are a number of steps on the path between CSRs and linux userspace (i.e. stuff running from a linux rootfs) | 10:53 |
| somlo | first, you probably want to build a full litex SoC including the bios (bare-metal software included in the bitstream that runs as soon as the soft CPU "wakes up") | 10:54 |
| somlo | a description of the CSRs MMIO addresses is typically generated under "build/<boardname>/software/include/generated/csr.h" | 10:54 |
| somlo | and used to compile the bios binary, which is then added as "rom" to the gateware/bitstream | 10:55 |
| somlo | mescobar: this stuff runs when you program the bitstream to your board, and it's smart enough to load a bunch of other things via either tftp or from an sdcard | 10:56 |
| somlo | that's where you want things like a DTB blob, linux kernel, initrd, etc. | 10:56 |
| somlo | you use the DT blob to tell e.g. linux what CSRs live at what addresses (more or less mirroring the generated csr.h) | 10:57 |
| somlo | and it's linux (or whatever kernel) that's expected to have drivers for the hardware, and tickle the CSRs, not so much userspace code | 10:58 |
| somlo | check out https://github.com/litex-hub/linux/tree/litex-rocket-rebase for a few examples of linux device drivers interacting with LiteX CSRs | 10:59 |
| tpb | Title: GitHub - litex-hub/linux at litex-rocket-rebase (at github.com) | 10:59 |
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