Trigger generic board error only when building

At present the generic board error can occur when configuring U-Boot, or
during distclean, but this is incorrect. The existing autoconf.mk may come
from an earlier U-Boot configuration which is about to be overwritten.

Make the error conditional so that it will only be triggered when we are
actually building U-Boot.

This avoids a problem where the system is being reconfigured to remove
CONFIG_SYS_GENERIC_BOARD on an architecture that does not support it.
Currently this will print an error and require the manual removal of
include/autoconf.mk.

Signed-off-by: Simon Glass <sjg@chromium.org>
sandbox: Provide a way to map from host RAM to U-Boot RAM

In many cases, pointers to memory are passed around, and these pointers
refer to U-Boot memory, not host memory. This in itself is not a
problem.

However, in a few places, we cast that pointer back to a ulong (being
a U-Boot memory address). It is possible to convert many of these cases
to avoid this. However there are data structures (e.g. struct
bootm_headers) which use pointers. We could with a lot of effort adjust
the structs and all code that uses them to use ulong instead of pointers.

This seems like an unacceptable cost, since our objective with sandbox
is to minimise the impact on U-Boot code while maximising the features
available to sandbox.

Therefore, create a map_to_sysmem() function which converts from a
pointer to a U-Boot address. This can be used sparingly when needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
sandbox: Switch over to generic board

Add generic board support for sandbox. and remove the old board init code.

Select CONFIG_SYS_GENERIC_BOARD for sandbox now that this is supported.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@ti.com>
sandbox: Add CONFIG_OF_HOSTFILE to read FDT from host file

With sandbox it is tricky to add an FDT to the image at build time (or
later) since we build an ELF file, not a plain binary, and the address
space of the whole U-Boot is not accessible in the emulated memory map
of sandbox.

Sandbox can read files directly from the host, though, so add an option
to read an FDT from a host file on start-up.

Signed-off-by: Simon Glass <sjg@chromium.org>
fdt: Add a parameter to fdt_valid()

At present this only checks working_fdt, but we want to check other FDTs
also. So add the FDT to check as a parameter to fdt_valid().

Signed-off-by: Simon Glass <sjg@chromium.org>
Add getenv_hex() to return an environment variable as hex

This conversion is required in a number of places in U-Boot. Add a
standard function to provide this feature, so we avoid all the different
variations in the way it is coded.

Signed-off-by: Simon Glass <sjg@chromium.org>
fdt: Allow fdt command to check and update control FDT

There is an existing fdt command to deal with the working FDT. Enhance this
to support the control FDT also (CONFIG_OF_CONTROL).

Signed-off-by: Simon Glass <sjg@chromium.org>
sandbox: fdt: Support fdt command for sandbox

By using map_sysmem() we can get the fdt command to work correctly with
sandbox.

Signed-off-by: Simon Glass <sjg@chromium.org>
fdt: Skip checking FDT if the pointer is NULL

If we have no FDT, don't attempt to read from it. This allows sandbox to
run without an FDT if required.

Signed-off-by: Simon Glass <sjg@chromium.org>
Revert "fdt- Tell the FDT library where the device tree is"

This reverts commit 3b73459ea3421e9f8c6c8c62e1d3fe458ca5bc56.

In practice it doesn't seem like a good idea to make the the working
FDT point to the control FDT. Now that we can access the control FDT
using the 'fdt' command, there is no need for this feature. Remove it.

Signed-off-by: Simon Glass <sjg@chromium.org>
sandbox: Allow -c argument to provide a command list

This allows passing of entire scripts to sandbox with the -c argument,
which is useful for testing. Commands can be delimited with a newline
or semicolon.

Signed-off-by: Simon Glass <sjg@chromium.org>
sandbox: Support 'source' command

Enhance the source command to work with sandbox, by using map_sysmem() to
convert a ulong address into a pointer.

Signed-off-by: Simon Glass <sjg@chromium.org>
fs: Add support for saving data to filesystems

Add a new method for saving that filesystems can implement. This mirrors the
existing load method.

Signed-off-by: Simon Glass <sjg@chromium.org>
sandbox: fs: Add support for saving files to host filesystem

This allows write of files from the host filesystem in sandbox. There is
currently no concept of overwriting the file and removing its existing
contents - all writing is done on top of what is there. This means that
writing 10 bytes to the start of a 1KB file will only update those 10
bytes, not truncate the file to 10 byte slong.

If the file does not exist it is created.

Signed-off-by: Simon Glass <sjg@chromium.org>
sandbox: config: Enable CONFIG_FIT and CONFIG_CMD_FIT

Enable these options to use FITs on sandbox.

Signed-off-by: Simon Glass <sjg@chromium.org>