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* [PATCH] Load PBL into SRAM
@ 2014-01-31  9:06 David Vincent
  2014-02-03  8:12 ` Sascha Hauer
  2014-02-04  3:56 ` Jean-Christophe PLAGNIOL-VILLARD
  0 siblings, 2 replies; 14+ messages in thread
From: David Vincent @ 2014-01-31  9:06 UTC (permalink / raw)
  To: barebox; +Cc: David Vincent

This allows to load all the lowlevel init code, including the
uncompressor, inside SRAM and not just the bare init part. This is
useful when pbl is used as a first-stage bootloader but is loaded by an
external firmware.

Signed-off-by: David Vincent <freesilicon@gmail.com>
---
 arch/arm/lib/pbl.lds.S            |    4 ++--
 common/Kconfig                    |   16 ++++++++++++++--
 include/asm-generic/barebox.lds.h |   14 +++++++++++++-
 pbl/Kconfig                       |    7 +++++++
 4 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/arch/arm/lib/pbl.lds.S b/arch/arm/lib/pbl.lds.S
index 0954c89..34c0cb3 100644
--- a/arch/arm/lib/pbl.lds.S
+++ b/arch/arm/lib/pbl.lds.S
@@ -50,11 +50,11 @@ SECTIONS
 		*(.text*)
 	}
 
+	BAREBOX_PBL_SIZE
+
 	/* Discard unwind if enable in barebox */
 	/DISCARD/ : { *(.ARM.ex*) }
 
-	BAREBOX_BARE_INIT_SIZE
-
 	. = ALIGN(4);
 	.rodata : { *(.rodata*) }
 
diff --git a/common/Kconfig b/common/Kconfig
index 8af7ec1..e067127 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -145,13 +145,25 @@ config BAREBOX_MAX_IMAGE_SIZE
 	help
 	  Define the maximum size of barebox
 
+config BAREBOX_MAX_PBL_SIZE
+	depends on PBL_IMAGE && LOAD_PBL_SRAM
+	prompt "Maximum pre-bootloader size"
+	hex
+	default 0xffffffff
+	help
+	  Define the maximum size of pbl
+	  this will allow your pbl to fit in SRAM as example
+	  ARCH can overwrite it via ARCH_BAREBOX_MAX_PBL_SIZE
+
 config BAREBOX_MAX_BARE_INIT_SIZE
-	prompt "Maximum bare_init size"
+	prompt "Maximum bare_init size" if !LOAD_PBL_SRAM
 	hex
+	range 0x0 BAREBOX_MAX_PBL_SIZE if LOAD_PBL_SRAM
+	default BAREBOX_MAX_PBL_SIZE if LOAD_PBL_SRAM
 	default 0xffffffff
 	help
 	  Define the maximum size of bare_init
-	  this will allow your bare_init will fit in SRAM as example
+	  this will allow your bare_init to fit in SRAM as example
 	  ARCH can overwrite it via ARCH_BAREBOX_MAX_BARE_INIT_SIZE
 
 config HAVE_CONFIGURABLE_MEMORY_LAYOUT
diff --git a/include/asm-generic/barebox.lds.h b/include/asm-generic/barebox.lds.h
index 6d3a69e..10b0885 100644
--- a/include/asm-generic/barebox.lds.h
+++ b/include/asm-generic/barebox.lds.h
@@ -60,10 +60,22 @@ CONFIG_ARCH_BAREBOX_MAX_BARE_INIT_SIZE < CONFIG_BAREBOX_MAX_BARE_INIT_SIZE
 #define MAX_BARE_INIT_SIZE CONFIG_BAREBOX_MAX_BARE_INIT_SIZE
 #endif
 
+#if defined(CONFIG_ARCH_BAREBOX_MAX_PBL_SIZE) && \
+CONFIG_ARCH_BAREBOX_MAX_PBL_SIZE < CONFIG_BAREBOX_MAX_PBL_SIZE
+#define MAX_PBL_SIZE CONFIG_ARCH_BAREBOX_MAX_PBL_SIZE
+#else
+#define MAX_PBL_SIZE CONFIG_BAREBOX_MAX_PBL_SIZE
+#endif
+
 #include <linux/stringify.h>
 /* use 2 ASSERT because ld can not accept '"size" "10"' format */
 #define BAREBOX_BARE_INIT_SIZE					\
 	_barebox_bare_init_size = __bare_init_end - _text;	\
 	ASSERT(_barebox_bare_init_size < MAX_BARE_INIT_SIZE, "Barebox bare_init size > ") \
-	ASSERT(_barebox_bare_init_size < MAX_BARE_INIT_SIZE, __stringify(MAX_BARE_INIT_SIZE)) \
+	ASSERT(_barebox_bare_init_size < MAX_BARE_INIT_SIZE, __stringify(MAX_BARE_INIT_SIZE))
 
+#define BAREBOX_PBL_SIZE					\
+	_barebox_pbl_size = __bss_start - _text;		\
+	ASSERT(MAX_BARE_INIT_SIZE <= MAX_PBL_SIZE, "bare_init cannot be bigger than pbl") \
+	ASSERT(_barebox_pbl_size < MAX_PBL_SIZE, "Barebox pbl size > ") \
+	ASSERT(_barebox_pbl_size < MAX_PBL_SIZE, __stringify(MAX_PBL_SIZE))
diff --git a/pbl/Kconfig b/pbl/Kconfig
index dc31357..1edc2d1 100644
--- a/pbl/Kconfig
+++ b/pbl/Kconfig
@@ -34,6 +34,13 @@ config PBL_FORCE_PIGGYDATA_COPY
 
 if PBL_IMAGE
 
+config LOAD_PBL_SRAM
+	bool "Load pbl in SRAM"
+	help
+	  Load the whole content of the pbl binary into SRAM. This is useful if you
+	  use the pbl as a first stage bootloader but cannot load the whole binary
+	  at the same time.
+
 config PBL_RELOCATABLE
 	depends on ARM
 	bool "relocatable pbl image"
-- 
1.7.10.4


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^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2014-02-20 16:32 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-01-31  9:06 [PATCH] Load PBL into SRAM David Vincent
2014-02-03  8:12 ` Sascha Hauer
     [not found]   ` <CAKRNOGz68GEnwU_qEu28xJHBuDsaird4qnepB6rHv48EGdMBOw@mail.gmail.com>
2014-02-03  9:58     ` Fwd: " David Vincent
2014-02-04  7:05       ` Sascha Hauer
2014-02-04  7:51         ` David Vincent
2014-02-04  3:56 ` Jean-Christophe PLAGNIOL-VILLARD
2014-02-04  6:57   ` Sascha Hauer
2014-02-04  7:04     ` Sascha Hauer
2014-02-04  7:49     ` David Vincent
2014-02-05  8:00       ` Sascha Hauer
2014-02-05 12:48         ` David Vincent
2014-02-05 15:45           ` Sascha Hauer
2014-02-20 16:32             ` David Vincent
2014-02-04  7:51   ` David Vincent

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