[U-Boot] [PATCH] arm: K3: sysfw-loader: Do not require full printf() for version info

[Andreas Dannenberg]

A previous commit...

commit 2a51e16bd57a ("configs: Make USE_TINY_PRINTF depend on SPL||TPL and be default")

...causes the System Firmware version string during SPL boot to no longer
getting printed to the console as expected. To fix this issue rework the
handling of that string to only use basic printf() syntax rather than
for example disabling CONFIG_USE_TINY_PRINTF on affected devices, this
way maintaining most of the memory size benefit the initial patch brings
when it comes to SPL.

Signed-off-by: Andreas Dannenberg <dannenberg at ti.com>
---
 arch/arm/mach-k3/sysfw-loader.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-k3/sysfw-loader.c b/arch/arm/mach-k3/sysfw-loader.c
index 2ede82004a..7a482bdc8a 100644
--- a/arch/arm/mach-k3/sysfw-loader.c
+++ b/arch/arm/mach-k3/sysfw-loader.c
@@ -251,10 +251,21 @@ void k3_sysfw_loader(void (*config_pm_done_callback)(void))
 	if (config_pm_done_callback)
 		config_pm_done_callback();
 
-	/* Output System Firmware version info */
-	printf("SYSFW ABI: %d.%d (firmware rev 0x%04x '%.*s')\n",
+	/*
+	 * Output System Firmware version info. Note that since the
+	 * 'firmware_description' field is not guaranteed to be zero-
+	 * terminated we manually add a \0 terminator if needed. Further
+	 * note that we intentionally no longer rely on the extended
+	 * printf() formatter '%.*s' to not having to require a more
+	 * full-featured printf() implementation.
+	 */
+	char fw_desc[sizeof(ti_sci->version.firmware_description) + 1];
+
+	strncpy(fw_desc, ti_sci->version.firmware_description,
+		sizeof(ti_sci->version.firmware_description));
+	fw_desc[sizeof(fw_desc) - 1] = '\0';
+
+	printf("SYSFW ABI: %d.%d (firmware rev 0x%04x '%s')\n",
 	       ti_sci->version.abi_major, ti_sci->version.abi_minor,
-	       ti_sci->version.firmware_revision,
-	       sizeof(ti_sci->version.firmware_description),
-	       ti_sci->version.firmware_description);
+	       ti_sci->version.firmware_revision, fw_desc);
 }
-- 
2.17.1