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version 1.1, 2009/10/21 01:06:48
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version 1.6, 2014/04/12 02:28:11
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| ## Jonathan Kollasch <jakllsch@NetBSD.org> |
# Jonathan Kollasch |
| I'm here, maybe I'll even make a [[todo]] list someday. |
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## [[!template id=man name="ddb" section="4"]] tips |
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### locating a softc |
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This locates a device's softc using it's `cfdriver_t` (e.g. `&mainbus_cd`, `&cpu_cd`) and its "device unit" (e.g. the `0` in `mainbus0`). |
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db{0}> call device_lookup_private(ohci_cd, 0) |
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0xffff800045fb2008 |
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### locating structure members |
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This uses [[!template id=man name="gdb" section="1"]] and a kernel with debugging symbols to find the offset to a element in a structure. |
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$ gdb netbsd.gdb |
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... |
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(gdb) print &((struct ohci_softc *)0)->iot |
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$3 = (bus_space_tag_t *) 0x478 |
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(gdb) print &((struct ohci_softc *)0)->ioh |
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$4 = (bus_space_handle_t *) 0x480 |
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### peeking at mapped registers |
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db{0}> call bus_space_read_4(*(ffff800045fb2008+478), *(ffff800045fb2008+480), 0) |
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0x110 |
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## Unfinished Projects |
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### x86 UEFI kernel loader |
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Needs more work and cleanup. |
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Work has been done using the OVMF BIOS images for Qemu. |
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### bcm47xx for evbmips |
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Boots multiuser on NFS root, needs more work and cleanup. |
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This project is on hold until there's a miniature userland that fits in 4-8MiB flash storage devices, on a flash-oriented file system. |
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[[!template id=man name="bce" section="4"]] and [[!template id=man name="bwi" section="4"]] would need refactoring to be bus-independent. |
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### Memory-mapped PCI config access on x86 |
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Needs cleanup, and maybe some more validation of MCFG tables. |
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