u-boot/arch/sandbox
Simon Glass 4213fc2913 sandbox: Add un/map_sysmen() to deal with sandbox's ram_buf
Sandbox doesn't actually provide U-Boot access to the machine's physical
memory. Instead it provides a RAM buffer of configurable size, and all
memory accesses are within that buffer. Sandbox memory starts at 0 and
is CONFIG_DRAM_SIZE bytes in size. Allowing access outside this buffer
might produce unpredictable results in the event of an error, and would
expose the host machine's memory architecture to the sandbox U-Boot.

Most U-Boot functions assume that they can just access memory at given
address. For sandbox this is not true.

Add a map_sysmem() call which converts a U-Boot address to a system
address. In most cases this is a NOP, but for sandbox it returns a
pointer to that memory inside the RAM buffer.

To get a U-Boot feature to work correctly within sandbox, you should call
map_sysmem() to get a pointer to the address, and then use that address for
any U-Boot memory accesses.

Signed-off-by: Simon Glass <sjg@chromium.org>
2013-02-28 19:09:22 -08:00
..
cpu sandbox: Improve sandbox serial port keyboard interface 2013-02-28 19:09:21 -08:00
include/asm sandbox: Add un/map_sysmen() to deal with sandbox's ram_buf 2013-02-28 19:09:22 -08:00
lib sandbox: Move ram_buf to arch_global_data 2013-02-04 09:05:45 -05:00
config.mk sandbox: Add un/map_sysmen() to deal with sandbox's ram_buf 2013-02-28 19:09:22 -08:00