diff options
Diffstat (limited to 'share/man/man4/sdhci.4')
| -rw-r--r-- | share/man/man4/sdhci.4 | 44 |
1 files changed, 24 insertions, 20 deletions
diff --git a/share/man/man4/sdhci.4 b/share/man/man4/sdhci.4 index 4a4e02539acd..1608d9c2fe1a 100644 --- a/share/man/man4/sdhci.4 +++ b/share/man/man4/sdhci.4 @@ -1,4 +1,6 @@ .\" +.\" SPDX-License-Identifier: BSD-2-Clause +.\" .\" Copyright (c) 2008 Alexander Motin <mav@FreeBSD.org> .\" All rights reserved. .\" @@ -22,7 +24,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd August 25, 2020 +.Dd October 3, 2025 .Dt SDHCI 4 .Os .Sh NAME @@ -56,21 +58,28 @@ detaches it on card removing. .Sh HARDWARE The .Nm -driver supports different specification compatible chips. -The following chips have been verified to work: +driver supports the SD Host Controller Specification. +When attaching via the PCI bus, +the controller is automatically configured. +Many SoC chips provide a SDHCI controller directly mapped to I/O memory. +For those, the controller may be configured using +.Xr fdt 4 +or +.Xr acpi 4 +methods, supplied by your board's vendor. .Pp -.Bl -bullet -compact -.It -ENE CB712 -.It -ENE CB714 -.It -RICOH R5C822 -.It -RICOH R5CE823 -.It -TI PCIXX21/XX11/XX12 -.El +Unlike most other drivers that support a generic standard, +.Nm +requires a large number of quirks to cope with hardware bugs, +proprietary registers and poorly specified power management. +While many chipsets from +Intel, Xilinx, Rockchip, Frescale, Ricoh, and TI have these entries, +suboptimal performance may result when using some controllers. +Quirks and custom configuration are most often required +when the device is configured via +.Xr fdt 4 +or +.Xr acpi 4 . .Sh SEE ALSO .Xr mmc 4 , .Xr mmcsd 4 @@ -79,8 +88,3 @@ TI PCIXX21/XX11/XX12 .Re .Sh AUTHORS .An Alexander Motin Aq Mt mav@FreeBSD.org -.Sh BUGS -Many of existing SD controller chips have some nonstandard requirements, -proprietary registers and hardware bugs, requiring additional handling. -ENE chips are handled to work fine, while some revisions of RICOH and TI -controllers still do not see cards without some additional initialization. |