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Emmanuel Vadot
1af3197bbe
The mmc(4) stack waits after powering up a card: mmc_power_up() waits 1 ms after the supplies are on and 2 ms after the clock is running, before the first command is sent. The MMCCAM probe had no such wait: it went from the power_up request to the power_on request to CMD0 without any delay. Some devices do not answer the first commands if they are sent too early and then never enumerate, with no error. On a RockPro64 the Broadcom SDIO Wi-Fi (BCM4359) was not detected on any of 8 boots without a delay. It was detected on 8 out of 8 with the same waits as mmc_power_up() added to the probe. Add the same two waits, once the power_up request and once the power_on request are done. This replaces the delay that was in mmc_fdt_set_power(), which was a fixed 10 ms for FDT hosts only; the waits of the legacy stack are enough and apply to every MMCCAM host. MFC after: 1 week Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D61077
FreeBSD Kernel Source:
This directory contains the source files and build glue that make up the FreeBSD kernel and its modules, including both original and contributed software.
Kernel configuration files are located in the conf/ subdirectory of each
architecture. GENERIC is the configuration used in release builds. NOTES
contains documentation of all possible entries. LINT is a compile-only
configuration used to maximize build coverage and detect regressions.
Documentation:
Source code documentation is maintained in a set of man pages, under section 9.
These pages are located in share/man/man9, from the
top-level of the src tree. Consult intro(9)
for an overview of existing pages.
Some additional high-level documentation of the kernel is maintained in the Architecture Handbook.
Source Roadmap:
| Directory | Description |
|---|---|
| amd64 | AMD64 (64-bit x86) architecture support |
| arm | 32-bit ARM architecture support |
| arm64 | 64-bit ARM (AArch64) architecture support |
| bsm | Basic Security Module headers - audit(4) and bsm(3) |
| cam | Common Access Method storage subsystem - cam(4) and ctl(4) |
| cddl | CDDL-licensed optional sources such as DTrace |
| compat | Linux compatibility layer, FreeBSD 32-bit compatibility |
| conf | kernel build glue |
| contrib | 3rd-party imported software such as OpenZFS |
| crypto | crypto drivers |
| ddb | interactive kernel debugger - ddb(4) |
| dev | device drivers and other arch independent code |
| dts | FreeBSD-specific device tree sources |
| fs | most filesystems, excluding UFS, NFS, and ZFS |
| gdb | kernel remote GDB stub - gdb(4) |
| geom | GEOM framework - geom(4) |
| gnu | GPL-licensed sources |
| i386 | i386 (32-bit x86) architecture support |
| isa | PC ISA bus implementation |
| kern | main part of the kernel |
| kgssapi | kernel-space GSSAPI implementation |
| libkern | libc-like and other support functions for kernel use |
| modules | kernel module infrastructure |
| net | core networking code |
| net80211 | wireless networking (IEEE 802.11) - net80211(4) |
| netgraph | graph-based networking subsystem - netgraph(4) |
| netinet | IPv4 protocol implementation - inet(4) |
| netinet6 | IPv6 protocol implementation - inet6(4) |
| netipsec | IPsec protocol implementation - ipsec(4) |
| netlink | kernel network configuration protocol - netlink(4) |
| netpfil | packet filters - ipfw(4), pf(4), and ipfilter(4) |
| netsmb | Server Message Block protocol implementation |
| nfs | common code and headers for Network File System |
| nfsclient | NFS client implementation for mounting and stats |
| nfsserver | NFS server implementation for exporting local filesystems to network |
| nlm | Network Lock Management protocol implementation |
| ofed | OpenFabrics Enterprise Distribution implementation |
| opencrypto | OpenCrypto framework - crypto(7) |
| powerpc | PowerPC/POWER (32 and 64-bit) architecture support |
| riscv | 64-bit RISC-V architecture support |
| rpc | Open Network Computing Remote Procedure Call implementation - rpc(3) |
| security | security facilities - audit(4) and mac(4) |
| sys | kernel headers |
| teken | terminal emulation interface implementation - teken(3) |
| tests | kernel unit tests |
| tools | kernel build scripts and utilities |
| ufs | Unix File System - ffs(4) |
| vm | virtual memory system |
| x86 | code shared by AMD64 and i386 architectures |
| xdr | External Data Representation implementation - xdr(3) |
| xen | Xen hypervisor support - xen(4) |