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08d53aa58c
Create a new /sys entry '/sys/firmware/fdt' to export the FDT blob that was passed to the kernel by the bootloader. This allows userland applications such as kexec to access the raw binary. The fact that this node does not reside under /sys/firmware/device-tree is deliberate: FDT is also used on arm64 UEFI/ACPI systems to communicate just the UEFI and ACPI entry points, but the FDT is never unflattened and used to configure the system. A CRC32 checksum is calculated over the entire FDT blob, and verified at late_initcall time. The sysfs entry is instantiated only if the checksum is valid, i.e., if the FDT blob has not been modified in the mean time. Otherwise, a warning is printed. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Grant Likely <grant.likely@linaro.org>
88 lines
1.4 KiB
Plaintext
88 lines
1.4 KiB
Plaintext
config DTC
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bool
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config OF
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bool
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menu "Device Tree and Open Firmware support"
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depends on OF
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config OF_UNITTEST
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bool "Device Tree runtime unit tests"
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depends on OF_IRQ && OF_EARLY_FLATTREE
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select OF_DYNAMIC
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select OF_RESOLVE
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help
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This option builds in test cases for the device tree infrastructure
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that are executed once at boot time, and the results dumped to the
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console.
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If unsure, say N here, but this option is safe to enable.
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config OF_FLATTREE
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bool
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select DTC
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select LIBFDT
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select CRC32
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config OF_EARLY_FLATTREE
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bool
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select OF_FLATTREE
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config OF_PROMTREE
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bool
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# Hardly any platforms need this. It is safe to select, but only do so if you
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# need it.
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config OF_DYNAMIC
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bool
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config OF_ADDRESS
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def_bool y
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depends on !SPARC
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select OF_ADDRESS_PCI if PCI
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config OF_ADDRESS_PCI
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bool
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config OF_IRQ
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def_bool y
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depends on !SPARC
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config OF_NET
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depends on NETDEVICES
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def_bool y
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config OF_MDIO
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def_tristate PHYLIB
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depends on PHYLIB
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help
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OpenFirmware MDIO bus (Ethernet PHY) accessors
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config OF_PCI
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def_tristate PCI
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depends on PCI
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help
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OpenFirmware PCI bus accessors
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config OF_PCI_IRQ
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def_tristate PCI
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depends on OF_PCI && OF_IRQ
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help
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OpenFirmware PCI IRQ routing helpers
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config OF_MTD
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depends on MTD
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def_bool y
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config OF_RESERVED_MEM
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depends on OF_EARLY_FLATTREE
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bool
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help
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Helpers to allow for reservation of memory regions
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config OF_RESOLVE
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bool
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endmenu # OF
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