[PATCH 1/1] cmd: fdt: remove CMD_FDT_MAX_DUMP

[Heinrich Schuchardt]

When printing the device tree we want to get an output that can be used as
input for the device tree compiler. This requires that we do not write
bogus lines like

    pcie at 10000000 {
            interrupt-map = * 0x4000127c [0x00000280];

For instance the QEMU virt device has a property interrupt-map with 640
bytes which exceeds CMD_FDT_MAX_DUMP=64.

So lets do away with the artificial limitation to 64 bytes.

As indicated in commit f0a29d43313c ("fdt: Limit printed hex in fdt print
and list commands") if a device tree contains binary blobs, it may still
be desirable to limit the output length. Provide environment variable
fdt_max_dump for this purpose.

Fixes: 5d927b428622 ("Kconfig: Drop CONFIG_CMD_FDT_MAX_DUMP")
Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 cmd/fdt.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/cmd/fdt.c b/cmd/fdt.c
index 99b1b5b3fc..89ab572d8d 100644
--- a/cmd/fdt.c
+++ b/cmd/fdt.c
@@ -21,7 +21,6 @@

 #define MAX_LEVEL	32		/* how deeply nested we will go */
 #define SCRATCHPAD	1024		/* bytes of scratchpad memory */
-#define CMD_FDT_MAX_DUMP 64

 /*
  * Global data (for the gd->bd)
@@ -934,11 +933,17 @@ static int is_printable_string(const void *data, int len)
 static void print_data(const void *data, int len)
 {
 	int j;
+	const char *env_max_dump;
+	ulong max_dump = ULONG_MAX;

 	/* no data, don't print */
 	if (len == 0)
 		return;

+	env_max_dump = env_get("fdt_max_dump");
+	if (env_max_dump)
+		max_dump = simple_strtoul(env_max_dump, NULL, 16);
+
 	/*
 	 * It is a string, but it may have multiple strings (embedded '\0's).
 	 */
@@ -957,7 +962,7 @@ static void print_data(const void *data, int len)
 	}

 	if ((len %4) == 0) {
-		if (len > CMD_FDT_MAX_DUMP)
+		if (len > max_dump)
 			printf("* 0x%p [0x%08x]", data, len);
 		else {
 			const __be32 *p;
@@ -969,7 +974,7 @@ static void print_data(const void *data, int len)
 			printf(">");
 		}
 	} else { /* anything else... hexdump */
-		if (len > CMD_FDT_MAX_DUMP)
+		if (len > max_dump)
 			printf("* 0x%p [0x%08x]", data, len);
 		else {
 			const u8 *s;
--
2.27.0