path: root/arch/architecture.dox
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authorJuergen Beisert <>2007-11-05 14:39:07 +0100
committerJuergen Beisert <>2007-11-05 14:39:07 +0100
commit4cd877a840026c10fcce9586cdf14e6c8d306078 (patch)
tree932d0ec3ac49c8acd4c0ae1122a9e764549f9056 /arch/architecture.dox
parenta26f5e995ea600c33d44b412d84c7257e5e2870c (diff)
saving added docu
Diffstat (limited to 'arch/architecture.dox')
1 files changed, 28 insertions, 1 deletions
diff --git a/arch/architecture.dox b/arch/architecture.dox
index 85cff53ed7..3f94b3c321 100644
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+++ b/arch/architecture.dox
@@ -1,6 +1,33 @@
/** @page dev_architecture Integrate a new architecture (ARCH)
+@section linker_scripts Rules for the generic Linker Script File
+Never include an object file by name directly! Linker Script Files defines the
+layout, not the content. Content is defined in objecfiles instead.
+Don't rely on the given object file order to create your binary U-Boot v2! This
+may work, but is not relyable in all cases (and its a very bad style)!
+For the special case some layout contraints exists, use specific section
+naming instead. Refer @ref reset_code how to define this specific section.
+@section reset_code Bring it up: The Reset Code
+The way a CPU wakes up after reset is very specific to its architecture.
+For example the ARM architecture starts its reset code at address 0x0000000,
+the x86 architecture at 0x000FFFF0, PowerPC at 0x00000100 or 0xFFFFF100.
+So for the special reset code on all architectures it must be located at
+architecture specific locations within the binary U-Boot image.
+All reset code uses section ".text_entry" for its localisation within the
+binary U-Boot image. Its up to the linker script file to use this section name
+to find the right place in whatever environment and U-Boot sizes.
+ .section ".text_entry","ax"