1 # SPDX-License-Identifier: GPL-2.0
6 Generic "hypervisor virtual console" infrastructure for various
7 hypervisors (pSeries, iSeries, Xen).
8 It will automatically be selected if one of the back-end console drivers
15 bool "pSeries Hypervisor Virtual Console support"
16 depends on PPC_PSERIES
20 pSeries machines when partitioned support a hypervisor virtual
21 console. This driver allows each pSeries partition to have a console
22 which is accessed via the HMC.
25 bool "Old driver for pSeries serial port (/dev/hvsi*)"
26 depends on HVC_CONSOLE
29 bool "OPAL Console support"
30 depends on PPC_POWERNV
35 PowerNV machines running under OPAL need that driver to get a console
38 bool "IBM RTAS Console support"
42 IBM Console device driver which makes use of RTAS
45 bool "z/VM IUCV Hypervisor console support (VM only)"
46 depends on S390 && NET
51 This driver provides a Hypervisor console (HVC) back-end to access
52 a Linux (console) terminal via a z/VM IUCV communication path.
55 bool "Xen Hypervisor Console support"
61 Xen virtual console device driver
63 config HVC_XEN_FRONTEND
64 bool "Xen Hypervisor Multiple Consoles support"
66 select XEN_XENBUS_FRONTEND
69 Xen driver for secondary virtual consoles
72 bool "udbg based fake hypervisor console"
76 This is meant to be used during HW bring up or debugging when
77 no other console mechanism exist but udbg, to get you a quick
78 console for userspace. Do NOT enable in production kernels.
81 bool "ARM JTAG DCC console"
82 depends on ARM || ARM64
84 select SERIAL_CORE_CONSOLE
86 This console uses the JTAG DCC on ARM to create a console under the HVC
87 driver. This console is used through a JTAG only on ARM. If you don't have
88 a JTAG then you probably don't want this option.
90 config HVC_DCC_SERIALIZE_SMP
91 bool "Use DCC only on CPU core 0"
92 depends on SMP && HVC_DCC
94 This is a DEBUG option to serialize all console input and output to CPU 0.
95 Some external debuggers, do not handle reads/writes from/to DCC on more
96 than one CPU core. Each core has its own DCC device registers, so when a
97 CPU core reads or writes from/to DCC, it only accesses its own DCC device.
98 Since kernel code can run on any CPU core, every time the kernel wants to
99 write to the console, it might write to a different DCC.
101 In SMP mode, external debuggers create multiple windows, and each window
102 shows the DCC output only from that core's DCC. The result is that
103 console output is either lost or scattered across windows.
105 Enable this option only if you are sure that you do not need features like
106 CPU hotplug to work. For example, during early chipset bringups without
107 debug serial console support. If unsure, say N.
110 bool "RISC-V SBI console support"
111 depends on RISCV_SBI && NONPORTABLE
114 This enables support for console output via RISC-V SBI calls, which
115 is normally used only during boot to output printk. This driver
116 conflicts with real console drivers and should not be enabled on
117 systems that directly access the console.
119 If you don't know what do to here, say N.
122 tristate "IBM Hypervisor Virtual Console Server support"
123 depends on PPC_PSERIES && HVC_CONSOLE
125 Partitionable IBM Power5 ppc64 machines allow hosting of
126 firmware virtual consoles from one Linux partition by
127 another Linux partition. This driver allows console data
128 from Linux partitions to be accessed through TTY device
129 interfaces in the device tree of a Linux partition running
132 To compile this driver as a module, choose M here: the
133 module will be called hvcs. Additionally, this module
134 will depend on arch specific APIs exported from hvcserver.ko
135 which will also be compiled when this driver is built as a