[U-Boot] [PATCH 1/4] Use absolute addressing for mpc85xx boot page
Trent Piepho
tpiepho at freescale.com
Tue Oct 14 01:39:08 CEST 2008
The boot page and reset vector need to be at the absolute address
0xfffff000 and 0xfffffffc, respectively, when the CPU boots.
However, their location in the U-Boot image is relative to the address that
flash is mapped at. For instance, mpc8572ds maps the 128MB flash boot bank
to 0xe8000000, which means the boot page is at 0xeffff000 in the U-Boot
image.
Currently the linker scripts use ADDR(.text) + 0x7f000 to location the boot
page, but this only works if .text starts 512kB from the end of the flash
window, e.g. TEXT_BASE is 0xeff80000 for mpc8572ds. If TEXT_BASE is
somewhere else, such as when creating a 256kB image, the boot page will be
at the wrong location.
To handle to both different U-Boot image sizes and flash locations, what we
do is take the upper bits of the boot page from the location of .text and
the lower bits are taken from the absolute address 0xfffff000. How many
bits to take depends on the size of the flash bank. In effect the upper
bits come from the location of the flash bank in the CPU address space and
the lower bits come from the fixed location of the boot page within the
flash bank.
The bss segment should go after the end of the u-boot image. Which is only
at the fixed address 0 for platforms that don't remap flash. For those
that do it's somewhere else, e.g. on mpc8572ds it's at 0xf0000000. The
easiest way to locate bss is to say it starts 4k after the boot page, since
we already put that in the final 4k of the image.
Since this part of the linker script is the same for all mpc85xx targets,
maybe it should be placed into an include file instead of duplicated?
Signed-off-by: Trent Piepho <tpiepho at freescale.com>
---
board/freescale/mpc8536ds/u-boot.lds | 11 +++++------
board/freescale/mpc8540ads/u-boot.lds | 11 +++++------
board/freescale/mpc8541cds/u-boot.lds | 11 +++++------
board/freescale/mpc8544ds/u-boot.lds | 12 ++++++------
board/freescale/mpc8548cds/u-boot.lds | 11 +++++------
board/freescale/mpc8555cds/u-boot.lds | 11 +++++------
board/freescale/mpc8560ads/u-boot.lds | 11 +++++------
board/freescale/mpc8568mds/u-boot.lds | 11 +++++------
board/freescale/mpc8572ds/u-boot.lds | 11 +++++------
9 files changed, 46 insertions(+), 54 deletions(-)
diff --git a/board/freescale/mpc8536ds/u-boot.lds b/board/freescale/mpc8536ds/u-boot.lds
index 901f633..05c8d4d 100644
--- a/board/freescale/mpc8536ds/u-boot.lds
+++ b/board/freescale/mpc8536ds/u-boot.lds
@@ -118,21 +118,20 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
- .bootpg ADDR(.text) + 0x7f000 :
+ __flash_mask = 128M - 1;
+ .bootpg (ADDR(.text) & ~(__flash_mask)) | (0xfffff000 & __flash_mask) :
{
cpu/mpc85xx/start.o (.bootpg)
} :text = 0xffff
- .resetvec ADDR(.text) + 0x7fffc :
+ .resetvec ADDR(.bootpg) + 0xffc :
{
*(.resetvec)
} :text = 0xffff
- . = ADDR(.text) + 0x80000;
-
- __bss_start = .;
- .bss (NOLOAD) :
+ .bss ADDR(.bootpg) + 0x1000 (NOLOAD) :
{
+ __bss_start = ABSOLUTE(.);
*(.sbss) *(.scommon)
*(.dynbss)
*(.bss)
diff --git a/board/freescale/mpc8540ads/u-boot.lds b/board/freescale/mpc8540ads/u-boot.lds
index 515d320..2148e12 100644
--- a/board/freescale/mpc8540ads/u-boot.lds
+++ b/board/freescale/mpc8540ads/u-boot.lds
@@ -121,21 +121,20 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
- .bootpg ADDR(.text) + 0x7f000 :
+ __flash_mask = 16M - 1;
+ .bootpg (ADDR(.text) & ~(__flash_mask)) | (0xfffff000 & __flash_mask) :
{
cpu/mpc85xx/start.o (.bootpg)
} :text = 0xffff
- .resetvec ADDR(.text) + 0x7fffc :
+ .resetvec ADDR(.bootpg) + 0xffc :
{
*(.resetvec)
} :text = 0xffff
- . = ADDR(.text) + 0x80000;
-
- __bss_start = .;
- .bss (NOLOAD) :
+ .bss ADDR(.bootpg) + 0x1000 (NOLOAD) :
{
+ __bss_start = ABSOLUTE(.);
*(.sbss) *(.scommon)
*(.dynbss)
*(.bss)
diff --git a/board/freescale/mpc8541cds/u-boot.lds b/board/freescale/mpc8541cds/u-boot.lds
index d728d8b..13ec8bf 100644
--- a/board/freescale/mpc8541cds/u-boot.lds
+++ b/board/freescale/mpc8541cds/u-boot.lds
@@ -118,21 +118,20 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
- .bootpg ADDR(.text) + 0x7f000 :
+ __flash_mask = 8M - 1; /* Flash bank is 8 MB */
+ .bootpg (ADDR(.text) & ~(__flash_mask)) | (0xfffff000 & __flash_mask) :
{
cpu/mpc85xx/start.o (.bootpg)
} :text = 0xffff
- .resetvec ADDR(.text) + 0x7fffc :
+ .resetvec ADDR(.bootpg) + 0xffc :
{
*(.resetvec)
} :text = 0xffff
- . = ADDR(.text) + 0x80000;
-
- __bss_start = .;
- .bss (NOLOAD) :
+ .bss ADDR(.bootpg) + 0x1000 (NOLOAD) :
{
+ __bss_start = ABSOLUTE(.);
*(.sbss) *(.scommon)
*(.dynbss)
*(.bss)
diff --git a/board/freescale/mpc8544ds/u-boot.lds b/board/freescale/mpc8544ds/u-boot.lds
index a05ece5..10a333b 100644
--- a/board/freescale/mpc8544ds/u-boot.lds
+++ b/board/freescale/mpc8544ds/u-boot.lds
@@ -118,21 +118,21 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
- .bootpg ADDR(.text) + 0x7f000 :
+ /* Flash blank size is 8M */
+ __flash_mask = 8M - 1;
+ .bootpg (ADDR(.text) & ~(__flash_mask)) | (0xfffff000 & __flash_mask) :
{
cpu/mpc85xx/start.o (.bootpg)
} :text = 0xffff
- .resetvec ADDR(.text) + 0x7fffc :
+ .resetvec ADDR(.bootpg) + 0xffc :
{
*(.resetvec)
} :text = 0xffff
- . = ADDR(.text) + 0x80000;
-
- __bss_start = .;
- .bss (NOLOAD) :
+ .bss ADDR(.bootpg) + 0x1000 (NOLOAD) :
{
+ __bss_start = ABSOLUTE(.);
*(.sbss) *(.scommon)
*(.dynbss)
*(.bss)
diff --git a/board/freescale/mpc8548cds/u-boot.lds b/board/freescale/mpc8548cds/u-boot.lds
index d4a2f72..2dca78a 100644
--- a/board/freescale/mpc8548cds/u-boot.lds
+++ b/board/freescale/mpc8548cds/u-boot.lds
@@ -118,21 +118,20 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
- .bootpg ADDR(.text) + 0x7f000 :
+ __flash_mask = 8M - 1; /* Flash bank is 8 MB */
+ .bootpg (ADDR(.text) & ~(__flash_mask)) | (0xfffff000 & __flash_mask) :
{
cpu/mpc85xx/start.o (.bootpg)
} :text = 0xffff
- .resetvec ADDR(.text) + 0x7fffc :
+ .resetvec ADDR(.bootpg) + 0xffc :
{
*(.resetvec)
} :text = 0xffff
- . = ADDR(.text) + 0x80000;
-
- __bss_start = .;
- .bss (NOLOAD) :
+ .bss ADDR(.bootpg) + 0x1000 (NOLOAD) :
{
+ __bss_start = ABSOLUTE(.);
*(.sbss) *(.scommon)
*(.dynbss)
*(.bss)
diff --git a/board/freescale/mpc8555cds/u-boot.lds b/board/freescale/mpc8555cds/u-boot.lds
index 11885e8..644db2c 100644
--- a/board/freescale/mpc8555cds/u-boot.lds
+++ b/board/freescale/mpc8555cds/u-boot.lds
@@ -118,21 +118,20 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
- .bootpg ADDR(.text) + 0x7f000 :
+ __flash_mask = 8M - 1; /* Flash bank is 8 MB */
+ .bootpg (ADDR(.text) & ~(__flash_mask)) | (0xfffff000 & __flash_mask) :
{
cpu/mpc85xx/start.o (.bootpg)
} :text = 0xffff
- .resetvec ADDR(.text) + 0x7fffc :
+ .resetvec ADDR(.bootpg) + 0xffc :
{
*(.resetvec)
} :text = 0xffff
- . = ADDR(.text) + 0x80000;
-
- __bss_start = .;
- .bss (NOLOAD) :
+ .bss ADDR(.bootpg) + 0x1000 (NOLOAD) :
{
+ __bss_start = ABSOLUTE(.);
*(.sbss) *(.scommon)
*(.dynbss)
*(.bss)
diff --git a/board/freescale/mpc8560ads/u-boot.lds b/board/freescale/mpc8560ads/u-boot.lds
index 515d320..2148e12 100644
--- a/board/freescale/mpc8560ads/u-boot.lds
+++ b/board/freescale/mpc8560ads/u-boot.lds
@@ -121,21 +121,20 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
- .bootpg ADDR(.text) + 0x7f000 :
+ __flash_mask = 16M - 1;
+ .bootpg (ADDR(.text) & ~(__flash_mask)) | (0xfffff000 & __flash_mask) :
{
cpu/mpc85xx/start.o (.bootpg)
} :text = 0xffff
- .resetvec ADDR(.text) + 0x7fffc :
+ .resetvec ADDR(.bootpg) + 0xffc :
{
*(.resetvec)
} :text = 0xffff
- . = ADDR(.text) + 0x80000;
-
- __bss_start = .;
- .bss (NOLOAD) :
+ .bss ADDR(.bootpg) + 0x1000 (NOLOAD) :
{
+ __bss_start = ABSOLUTE(.);
*(.sbss) *(.scommon)
*(.dynbss)
*(.bss)
diff --git a/board/freescale/mpc8568mds/u-boot.lds b/board/freescale/mpc8568mds/u-boot.lds
index ad96410..0c59e8c 100644
--- a/board/freescale/mpc8568mds/u-boot.lds
+++ b/board/freescale/mpc8568mds/u-boot.lds
@@ -118,21 +118,20 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
- .bootpg ADDR(.text) + 0x7f000 :
+ __flash_mask = 8M - 1; /* Flash bank is 8 MB */
+ .bootpg (ADDR(.text) & ~(__flash_mask)) | (0xfffff000 & __flash_mask) :
{
cpu/mpc85xx/start.o (.bootpg)
} :text = 0xffff
- .resetvec ADDR(.text) + 0x7fffc :
+ .resetvec ADDR(.bootpg) + 0xffc :
{
*(.resetvec)
} :text = 0xffff
- . = ADDR(.text) + 0x80000;
-
- __bss_start = .;
- .bss (NOLOAD) :
+ .bss ADDR(.bootpg) + 0x1000 (NOLOAD) :
{
+ __bss_start = ABSOLUTE(.);
*(.sbss) *(.scommon)
*(.dynbss)
*(.bss)
diff --git a/board/freescale/mpc8572ds/u-boot.lds b/board/freescale/mpc8572ds/u-boot.lds
index a05ece5..7ee7d61 100644
--- a/board/freescale/mpc8572ds/u-boot.lds
+++ b/board/freescale/mpc8572ds/u-boot.lds
@@ -118,21 +118,20 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
- .bootpg ADDR(.text) + 0x7f000 :
+ __flash_mask = 128M - 1;
+ .bootpg (ADDR(.text) & ~(__flash_mask)) | (0xfffff000 & __flash_mask) :
{
cpu/mpc85xx/start.o (.bootpg)
} :text = 0xffff
- .resetvec ADDR(.text) + 0x7fffc :
+ .resetvec ADDR(.bootpg) + 0xffc :
{
*(.resetvec)
} :text = 0xffff
- . = ADDR(.text) + 0x80000;
-
- __bss_start = .;
- .bss (NOLOAD) :
+ .bss ADDR(.bootpg) + 0x1000 (NOLOAD) :
{
+ __bss_start = ABSOLUTE(.);
*(.sbss) *(.scommon)
*(.dynbss)
*(.bss)
--
1.5.4.1
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