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| author | Simon Glass <sjg@chromium.org> | 2021-03-15 17:25:35 +1300 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2021-03-26 17:03:09 +1300 |
| commit | 95a5825f3134ff47f1e0cf37b4014b5c2e2027b5 (patch) | |
| tree | beb9aa23865aa046e36227e42f3bceddfb18cf8b | |
| parent | 6c914e4232cd262001645e932e9156555f1a5823 (diff) | |
| download | u-boot-95a5825f3134ff47f1e0cf37b4014b5c2e2027b5.tar.gz | |
dm: core: Add an option to support SPL in read-only memory
Some systems (e.g. x86 APL) run SPL from read-only memory. The device
instances created by dtoc are therefore not writeable. To make things work
we would need to copy the devices to read/write memory.
To avoid this, add an option to use a separate runtime struct for devices,
just as is done for drivers. This can be used to hold information that
changes at runtime, avoiding the need for a copy.
Also add a Kconfig option for read-only SPL, which selects this feature.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | common/spl/Kconfig | 24 | ||||
| -rw-r--r-- | dts/Kconfig | 22 |
2 files changed, 46 insertions, 0 deletions
diff --git a/common/spl/Kconfig b/common/spl/Kconfig index 774541c02b..584f8483e2 100644 --- a/common/spl/Kconfig +++ b/common/spl/Kconfig @@ -276,6 +276,19 @@ config SPL_SEPARATE_BSS location is used. Normally we put the device tree at the end of BSS but with this option enabled, it goes at _image_binary_end. +config SPL_READ_ONLY + bool + depends on SPL_OF_PLATDATA + # Bind cannot be supported because the udevice structs are in read-only + # memory so we cannot update the linked lists. + select SPL_OF_PLATDATA_NO_BIND + select SPL_OF_PLATDATA_RT + help + Some platforms (e.g. x86 Apollo Lake) load SPL into a read-only + section of memory. This means that of-platdata must make a copy (in + writeable memory) of anything it wants to modify, such as + device-private data. + config SPL_BANNER_PRINT bool "Enable output of the SPL banner 'U-Boot SPL ...'" default y @@ -1440,6 +1453,17 @@ config TPL_STACK The address of the initial stack-pointer for the TPL stage. Usually this will be the (aligned) top-of-stack. +config TPL_READ_ONLY + bool + depends on TPL_OF_PLATDATA + select TPL_OF_PLATDATA_NO_BIND + select TPL_OF_PLATDATA_RT + help + Some platforms (e.g. x86 Apollo Lake) load SPL into a read-only + section of memory. This means that of-platdata must make a copy (in + writeable memory) of anything it wants to modify, such as + device-private data. + config TPL_BOOTROM_SUPPORT bool "Support returning to the BOOTROM (from TPL)" help diff --git a/dts/Kconfig b/dts/Kconfig index d289752a13..e6bbdc596b 100644 --- a/dts/Kconfig +++ b/dts/Kconfig @@ -380,6 +380,17 @@ config SPL_OF_PLATDATA_NO_BIND some code space in U-Boot. This can be disabled if binding is needed, at the code of some code size increase. +config SPL_OF_PLATDATA_RT + bool "Use a separate struct for device runtime data" + depends on SPL_OF_PLATDATA_INST + default y + help + For systems running SPL from read-only memory it is convenient to + separate out the runtime information, so that the devices don't need + to be copied before being used. This moves the read-write parts of + struct udevice (at present just the flags) into a separate struct, + which is allocated at runtime. + endif config TPL_OF_PLATDATA @@ -429,6 +440,17 @@ config TPL_OF_PLATDATA_NO_BIND some code space in U-Boot. This can be disabled if binding is needed, at the code of some code size increase. +config TPL_OF_PLATDATA_RT + bool "Use a separate struct for device runtime data" + depends on TPL_OF_PLATDATA_INST + default y + help + For systems running TPL from read-only memory it is convenient to + separate out the runtime information, so that the devices don't need + to be copied before being used. This moves the read-write parts of + struct udevice (at present just the flags) into a separate struct, + which is allocated at runtime. + endif endmenu |