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RTSX(4) Kernel Interfaces Manual RTSX(4) NAME rtsx -- Realtek SD card reader SYNOPSIS To compile this driver into the kernel, place the following lines in the kernel configuration file: device mmc device mmcsd device rtsx Alternatively, to load the driver as a module at boot time, place the following lines in loader.conf(5): mmc_load="YES" mmcsd_load="YES" rtsx_load="YES" DESCRIPTION The rtsx driver provides support for Realtek SD card reader. Driver attaches mmc bus on card insertion and detaches it on card removing. HARDWARE The rtsx driver supports the following Realtek SD card readers: • RTS5209 • RTS5227 • RTS5229 • RTS522A • RTS525A • RTS5260 • RTL8411B • RTS5249 (unverified) • RTL8402 (unverified) • RTL8411 (unverified) SEE ALSO mmc(4), mmcsd(4) SD Specifications, Part 2, SD Host Controller, Simplified Specification SanDisk Secure Digital Card. HISTORY The rtsx driver appeared in FreeBSD 13.0 and was ported from OpenBSD with modifications found in Linux and NetBSD. AUTHORS Henri Hennebert <hlh@restart.be> Gary Jennejohn <gj@freebsd.org> Jesper Schmitz Mouridsen <jsm@FreeBSD.org> CONTRIBUTORS Lutz Bichler <Lutz.Bichler@gmail.com> DEBUGGING INFORMATION dev.rtsx.0.debug_mask can be set with the following masks: • 0x01 - to show the basic flow of the driver, • 0x02 - to trace the SD commands, • 0x04 - to trace the tuning phase. BUGS • RTS522A on Lenovo T470p, card detection and read-only switch are reversed. This is solved by adding in loader.conf(5): dev.rtsx.0.inversion=1 The driver tries to automate those exceptions. If this automation is wrong, it can be avoided by adding in loader.conf(5): dev.rtsx.0.inversion=0 • Mounting a filesystem with write access on a card write protected may involve a kernel crash. • Suspend/Resume do not work under MMCCAM. • For some chips (e.g. RTS5260) after devctl disable/enable or kldunload/kldload the driver can't detect a card correctly. FreeBSD 15.0 May 26, 2025 RTSX(4)
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | SEE ALSO | HISTORY | AUTHORS | CONTRIBUTORS | DEBUGGING INFORMATION | BUGS
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