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doc: Clean up SYS_MALLOC_SIMPLE

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Move the useful help to Kconfig.

Drop mention of CONFIG_SYS_MALLOC_SIMPLE since it doesn't exist.

Correct a 'CONFIGSYS_MALLOC_F_LEN' typo

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2023-09-26 08:14:29 -06:00 committed by Tom Rini
parent 34bacebd0a
commit 5bcacd1ad5
3 changed files with 12 additions and 23 deletions
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15
Kconfig
View File

@ -277,10 +277,17 @@ config SYS_MALLOC_F_LEN
default 0x10000 if ARCH_IMX8 || ARCH_IMX8M
default 0x2000
help
Before relocation, memory is very limited on many platforms. Still,
we can provide a small malloc() pool if needed. Driver model in
particular needs this to operate, so that it can allocate the
initial serial device and any others that are needed.
Size of the malloc() pool for use before relocation. If
this is defined, then a very simple malloc() implementation
will become available before relocation. The address is just
below the global data, and the stack is moved down to make
space.
This feature allocates regions with increasing addresses
within the region. calloc() is supported, but realloc()
is not available. free() is supported but does nothing.
The memory will be freed (or in fact just forgotten) when
U-Boot relocates itself.
config SYS_MALLOC_LEN
hex "Define memory for Dynamic allocation"

18
README
View File

@ -1281,24 +1281,6 @@ Configuration Settings:
- CONFIG_SYS_MALLOC_LEN:
Size of DRAM reserved for malloc() use.
- CONFIG_SYS_MALLOC_F_LEN
Size of the malloc() pool for use before relocation. If
this is defined, then a very simple malloc() implementation
will become available before relocation. The address is just
below the global data, and the stack is moved down to make
space.
This feature allocates regions with increasing addresses
within the region. calloc() is supported, but realloc()
is not available. free() is supported but does nothing.
The memory will be freed (or in fact just forgotten) when
U-Boot relocates itself.
- CONFIG_SYS_MALLOC_SIMPLE
Provides a simple and small malloc() and calloc() for those
boards which do not use the full malloc in SPL (which is
enabled with CONFIG_SPL_SYS_MALLOC).
- CFG_SYS_BOOTMAPSZ:
Maximum size of memory mapped by the startup code of
the Linux kernel; all data that must be processed by

2
doc/usage/cmd/bdinfo.rst
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@ -106,7 +106,7 @@ sp start
Early malloc usage
amount of memory used in the early malloc memory and its maximum size
as defined by CONFIGSYS_MALLOC_F_LEN
as defined by CONFIG_SYS_MALLOC_F_LEN
Configuration
-------------