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Diffstat (limited to 'doc/develop/driver-model/design.rst')
| -rw-r--r-- | doc/develop/driver-model/design.rst | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/doc/develop/driver-model/design.rst b/doc/develop/driver-model/design.rst index 20611e85e3..8c2c81d7ac 100644 --- a/doc/develop/driver-model/design.rst +++ b/doc/develop/driver-model/design.rst @@ -1114,12 +1114,12 @@ Pre-Relocation Support ---------------------- For pre-relocation we simply call the driver model init function. Only -drivers marked with DM_FLAG_PRE_RELOC or the device tree 'u-boot,dm-pre-reloc' +drivers marked with DM_FLAG_PRE_RELOC or the device tree 'bootph-all' property are initialised prior to relocation. This helps to reduce the driver model overhead. This flag applies to SPL and TPL as well, if device tree is enabled (CONFIG_OF_CONTROL) there. -Note when device tree is enabled, the device tree 'u-boot,dm-pre-reloc' +Note when device tree is enabled, the device tree 'bootph-all' property can provide better control granularity on which device is bound before relocation. While with DM_FLAG_PRE_RELOC flag of the driver all devices with the same driver are bound, which requires allocation a large @@ -1128,14 +1128,15 @@ only way for statically declared devices via U_BOOT_DRVINFO() to be bound prior to relocation. It is possible to limit this to specific relocation steps, by using -the more specialized 'u-boot,dm-spl' and 'u-boot,dm-tpl' flags -in the device tree node. For U-Boot proper you can use 'u-boot,dm-pre-proper' +the more specialized 'bootph-pre-ram' and 'bootph-pre-sram' flags +in the device tree node. For U-Boot proper you can use 'bootph-some-ram' which means that it will be processed (and a driver bound) in U-Boot proper prior to relocation, but will not be available in SPL or TPL. -To reduce the size of SPL and TPL, only the nodes with pre-relocation properties -('u-boot,dm-pre-reloc', 'u-boot,dm-spl' or 'u-boot,dm-tpl') are keept in their -device trees (see README.SPL for details); the remaining nodes are always bound. +To reduce the size of SPL and TPL, only the nodes with pre-relocation +properties ('bootph-all', 'bootph-pre-ram' or 'bootph-pre-sram') are kept in +their device trees (see README.SPL for details); the remaining nodes are +always bound. Then post relocation we throw that away and re-init driver model again. For drivers which require some sort of continuity between pre- and |