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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2025-03-30 15:25:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2025-03-30 15:25:15 -0700 |
| commit | 7405c0f01aa281e20d9f9f34ac450537985bfb05 (patch) | |
| tree | be12851dd3811287bcd8d8abd5bba78d73457ca6 /Documentation | |
| parent | b4c5c57c2d8d00c982b3620f8c95d5cd468e16e9 (diff) | |
| parent | 31ab12df723543047c3fc19cb8f8c4498ec6267f (diff) | |
Merge tag 'x86-urgent-2025-03-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull misc x86 fixes and updates from Ingo Molnar:
- Fix a large number of x86 Kconfig dependency and help text accuracy
bugs/problems, by Mateusz Jończyk and David Heideberg
- Fix a VM_PAT interaction with fork() crash. This also touches core
kernel code
- Fix an ORC unwinder bug for interrupt entries
- Fixes and cleanups
- Fix an AMD microcode loader bug that can promote verification
failures into success
- Add early-printk support for MMIO based UARTs on an x86 board that
had no other serial debugging facility and also experienced early
boot crashes
* tag 'x86-urgent-2025-03-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/microcode/AMD: Fix __apply_microcode_amd()'s return value
x86/mm/pat: Fix VM_PAT handling when fork() fails in copy_page_range()
x86/fpu: Update the outdated comment above fpstate_init_user()
x86/early_printk: Add support for MMIO-based UARTs
x86/dumpstack: Fix inaccurate unwinding from exception stacks due to misplaced assignment
x86/entry: Fix ORC unwinder for PUSH_REGS with save_ret=1
x86/Kconfig: Fix lists in X86_EXTENDED_PLATFORM help text
x86/Kconfig: Correct X86_X2APIC help text
x86/speculation: Remove the extra #ifdef around CALL_NOSPEC
x86/Kconfig: Document release year of glibc 2.3.3
x86/Kconfig: Make CONFIG_PCI_CNB20LE_QUIRK depend on X86_32
x86/Kconfig: Document CONFIG_PCI_MMCONFIG
x86/Kconfig: Update lists in X86_EXTENDED_PLATFORM
x86/Kconfig: Move all X86_EXTENDED_PLATFORM options together
x86/Kconfig: Always enable ARCH_SPARSEMEM_ENABLE
x86/Kconfig: Enable X86_X2APIC by default and improve help text
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 5e351ac52cca..3435a062a208 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1407,14 +1407,21 @@ earlyprintk=serial[,0x...[,baudrate]] earlyprintk=ttySn[,baudrate] earlyprintk=dbgp[debugController#] - earlyprintk=pciserial[,force],bus:device.function[,baudrate] + earlyprintk=pciserial[,force],bus:device.function[,{nocfg|baudrate}] earlyprintk=xdbc[xhciController#] earlyprintk=bios + earlyprintk=mmio,membase[,{nocfg|baudrate}] earlyprintk is useful when the kernel crashes before the normal console is initialized. It is not enabled by default because it has some cosmetic problems. + Only 32-bit memory addresses are supported for "mmio" + and "pciserial" devices. + + Use "nocfg" to skip UART configuration, assume + BIOS/firmware has configured UART correctly. + Append ",keep" to not disable it when the real console takes over. |