[PATCH v2 1/3] cmd: fdt: move: Use map_sysmem to convert pointers

Andre Przywara andre.przywara at arm.com
Fri Feb 10 12:02:11 CET 2023

The "fdt move" subcommand was using the provided DTB addresses directly,
without trying to "map" them into U-Boot's address space. This happened
to work since on the vast majority of "real" platforms there is a simple
1:1 mapping of VA to PAs, so either value works fine.

However this is not true on the sandbox, so the "fdt move" command fails
there miserably:
=> fdt addr $fdtcontroladdr
=> cp.l $fdtcontroladdr $fdt_addr_r 40  # simple memcpy works
=> fdt move $fdtcontroladdr $fdt_addr_r
Segmentation fault

Use the proper "map_sysmem" call to convert PAs to VAs, to make this
more robust in general and to enable operation in the sandbox.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
 cmd/fdt.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/cmd/fdt.c b/cmd/fdt.c
index 8e51a431261..0ba691c573b 100644
--- a/cmd/fdt.c
+++ b/cmd/fdt.c
@@ -231,11 +231,11 @@ static int do_fdt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 		 * Set the address and length of the fdt.
-		working_fdt = (struct fdt_header *)hextoul(argv[2], NULL);
+		working_fdt = map_sysmem(hextoul(argv[2], NULL), 0);
 		if (!fdt_valid(&working_fdt))
 			return 1;
-		newaddr = (struct fdt_header *)hextoul(argv[3], NULL);
+		newaddr = map_sysmem(hextoul(argv[3], NULL), 0);
 		 * If the user specifies a length, use that.  Otherwise use the
@@ -262,7 +262,7 @@ static int do_fdt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 			return 1;
-		set_working_fdt_addr((ulong)newaddr);
+		set_working_fdt_addr(map_to_sysmem(newaddr));
 	/* Call the board-specific fixup routine */
 	} else if (strncmp(argv[1], "sys", 3) == 0) {

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