cmd/fdt: add possibilty to have 'extrasize' on fdt resize

Sometimes devicetree nodes and or properties are added out of the u-boot
console, maybe through some script or manual interaction.

The devicetree as loaded or embedded is quite small, so the devicetree
has to be resized to take up those new nodes/properties.

In original the devicetree was only extended by effective
4 * add_mem_rsv.

With this commit we can add an argument to the "fdt resize" command,
which takes the extrasize to be added.

Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>

Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>
Acked-by: Simon Glass <sjg@chromium.org>

board/compulab/cm_fx6/cm_fx6.c

@@ -602,7 +602,7 @@ int ft_board_setup(void *blob, bd_t *bd)
 	char baseboard_name[16];
 	int err;
 
-	fdt_shrink_to_minimum(blob); /* Make room for new properties */
+	fdt_shrink_to_minimum(blob, 0); /* Make room for new properties */
 
 	/* MAC addr */
 	if (eth_getenv_enetaddr("ethaddr", enetaddr)) {

cmd/fdt.c

@@ -662,7 +662,12 @@ static int do_fdt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #endif
 	/* resize the fdt */
 	else if (strncmp(argv[1], "re", 2) == 0) {
-		fdt_shrink_to_minimum(working_fdt);
+		uint extrasize;
+		if (argc > 2)
+			extrasize = simple_strtoul(argv[2], NULL, 16);
+		else
+			extrasize = 0;
+		fdt_shrink_to_minimum(working_fdt, extrasize);
 	}
 	else {
 		/* Unrecognized command */
@@ -1056,7 +1061,7 @@ static char fdt_help_text[] =
 	"fdt systemsetup                     - Do system-specific set up\n"
 #endif
 	"fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n"
-	"fdt resize                          - Resize fdt to size + padding to 4k addr\n"
+	"fdt resize [<extrasize>]            - Resize fdt to size + padding to 4k addr + some optional <extrasize> if needed\n"
 	"fdt print  <path> [<prop>]          - Recursive print starting at <path>\n"
 	"fdt list   <path> [<prop>]          - Print one level starting at <path>\n"
 	"fdt get value <var> <path> <prop>   - Get <property> and store in <var>\n"

common/fdt_support.c

@@ -523,7 +523,7 @@ void fdt_fixup_ethernet(void *fdt)
 }
 
 /* Resize the fdt to its actual size + a bit of padding */
-int fdt_shrink_to_minimum(void *blob)
+int fdt_shrink_to_minimum(void *blob, uint extrasize)
 {
 	int i;
 	uint64_t addr, size;
@@ -551,6 +551,7 @@ int fdt_shrink_to_minimum(void *blob)
 	actualsize = fdt_off_dt_strings(blob) +
 		fdt_size_dt_strings(blob) + 5 * sizeof(struct fdt_reserve_entry);
 
+	actualsize += extrasize;
 	/* Make it so the fdt ends on a page boundary */
 	actualsize = ALIGN(actualsize + ((uintptr_t)blob & 0xfff), 0x1000);
 	actualsize = actualsize - ((uintptr_t)blob & 0xfff);

common/image-fdt.c

@@ -503,7 +503,7 @@ int image_setup_libfdt(bootm_headers_t *images, void *blob,
 		lmb_free(lmb, (phys_addr_t)(u32)(uintptr_t)blob,
 			 (phys_size_t)fdt_totalsize(blob));
 
-	ret = fdt_shrink_to_minimum(blob);
+	ret = fdt_shrink_to_minimum(blob, 0);
 	if (ret < 0)
 		goto err;
 	of_size = ret;

include/fdt_support.h

@@ -167,7 +167,15 @@ void ft_pci_setup(void *blob, bd_t *bd);
 int ft_system_setup(void *blob, bd_t *bd);
 
 void set_working_fdt_addr(ulong addr);
-int fdt_shrink_to_minimum(void *blob);
+
+/**
+ * shrink down the given blob to minimum size + some extrasize if required
+ *
+ * @param blob		FDT blob to update
+ * @param extrasize	additional bytes needed
+ * @return 0 if ok, or -FDT_ERR_... on error
+ */
+int fdt_shrink_to_minimum(void *blob, uint extrasize);
 int fdt_increase_size(void *fdt, int add_len);
 
 int fdt_fixup_nor_flash_size(void *blob);