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authorSimon Glass <sjg@chromium.org>2021-03-15 17:25:35 +1300
committerSimon Glass <sjg@chromium.org>2021-03-26 17:03:09 +1300
commit95a5825f3134ff47f1e0cf37b4014b5c2e2027b5 (patch)
treebeb9aa23865aa046e36227e42f3bceddfb18cf8b /dts
parent6c914e4232cd262001645e932e9156555f1a5823 (diff)
downloadu-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>
Diffstat (limited to 'dts')
-rw-r--r--dts/Kconfig22
1 files changed, 22 insertions, 0 deletions
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