arm: Shorten the Firmware Update (FWU) process
The watchdog is configured with a default value of 256 seconds in order
to implement the Trusted Board Boot Requirements.
For the FVP and Juno platforms, the FWU process relies on a watchdog
reset. In order to automate the test of FWU, the length of this process
needs to be as short as possible. Instead of waiting for those 4 minutes
to have a reset by the watchdog, tell it to reset immediately.
There are no side effects as the value of the watchdog's load register
resets to 0xFFFFFFFF.
Tested on Juno.
Change-Id: Ib1aea80ceddc18ff1e0813a5b98dd141ba8a3ff2
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
diff --git a/plat/arm/board/fvp/fvp_err.c b/plat/arm/board/fvp/fvp_err.c
new file mode 100644
index 0000000..2437cd4
--- /dev/null
+++ b/plat/arm/board/fvp/fvp_err.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2019, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <errno.h>
+
+#include <common/debug.h>
+#include <drivers/arm/sp805.h>
+#include <drivers/cfi/v2m_flash.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+
+/*
+ * FVP error handler
+ */
+__dead2 void plat_arm_error_handler(int err)
+{
+ int ret;
+
+ switch (err) {
+ case -ENOENT:
+ case -EAUTH:
+ /* Image load or authentication error. Erase the ToC */
+ INFO("Erasing FIP ToC from flash...\n");
+ (void)nor_unlock(PLAT_ARM_FIP_BASE);
+ ret = nor_word_program(PLAT_ARM_FIP_BASE, 0);
+ if (ret != 0) {
+ ERROR("Cannot erase ToC\n");
+ } else {
+ INFO("Done\n");
+ }
+ break;
+ default:
+ /* Unexpected error */
+ break;
+ }
+
+ (void)console_flush();
+
+ /* Setup the watchdog to reset the system as soon as possible */
+ sp805_refresh(ARM_SP805_TWDG_BASE, 1U);
+
+ for (;;)
+ wfi();
+}