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authorYouness Alaoui <youness.alaoui@puri.sm>2017-05-11 10:36:29 -0400
committerMartin Roth <martinroth@google.com>2017-06-04 18:44:56 +0200
commitc4b4ff3b1fb7960621a245df0627339db9db7037 (patch)
tree1c170d160ff76c896b97c44339f1f886e64cc5d0 /src/include/console
parentcadd7c7ed31e7901c56e6d0dc7a0aba7e34c776d (diff)
downloadcoreboot-c4b4ff3b1fb7960621a245df0627339db9db7037.tar.xz
console/flashsconsole: Add spi flash console for debugging
If CONSOLE_SPI_FLASH config is enabled, we write the cbmem messages to the 'CONSOLE' area in FMAP which allows us to grab the log when we read the flash. This is useful when you don't have usb debugging, and UART lines are hard to find. Since a failure to boot would require a hardware flasher anyways, we can get the log at the same time. This feature should only be used when no alternative is found and only when we can't boot the system, because excessive writes to the flash is not recommended. This has been tested on purism/librem13 v2 and librem 15 v3 which run Intel Skylake hardware. It has not been tested on other archs or with a driver other than the fast_spi. Change-Id: I74a297b94f6881d8c27cbe5168f161d8331c3df3 Signed-off-by: Youness Alaoui <youness.alaoui@puri.sm> Reviewed-on: https://review.coreboot.org/19849 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Diffstat (limited to 'src/include/console')
-rw-r--r--src/include/console/flash.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/src/include/console/flash.h b/src/include/console/flash.h
new file mode 100644
index 0000000000..07bc724b19
--- /dev/null
+++ b/src/include/console/flash.h
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef CONSOLE_FLASH_H
+#define CONSOLE_FLASH_H 1
+
+#include <rules.h>
+#include <stdint.h>
+
+void flashconsole_init(void);
+void flashconsole_tx_byte(unsigned char c);
+void flashconsole_tx_flush(void);
+
+#define __CONSOLE_FLASH_ENABLE__ IS_ENABLED(CONFIG_CONSOLE_SPI_FLASH)
+
+#if __CONSOLE_FLASH_ENABLE__
+static inline void __flashconsole_init(void) { flashconsole_init(); }
+static inline void __flashconsole_tx_byte(u8 data)
+{
+ flashconsole_tx_byte(data);
+}
+static inline void __flashconsole_tx_flush(void)
+{
+ flashconsole_tx_flush();
+}
+#else
+static inline void __flashconsole_init(void) {}
+static inline void __flashconsole_tx_byte(u8 data) {}
+static inline void __flashconsole_tx_flush(void) {}
+#endif /* __CONSOLE_FLASH_ENABLE__ */
+
+
+#endif /* CONSOLE_FLASH_H */