Help with Nios II linux from rocketboards.org

The 0xe prefix to address for io ports is correct, which bypass the cache.

I don't quite understand your question about u-boot. In typical configuration, we can seperate kernel and dts binding and u-boot pass dtb to kernel. That is, a single kernel image can be used for several similar boards, each board has a specific dtb. So you may select u-boot in kerenel config, and you don't need to specify dts in kernel config. However, dts property name is sometime related to kernel version.

There is a change in usng math code from libgcc. Please apply this patch by hand.

diff --git a/arch/nios2/kernel/vmlinux.lds.S b/arch/nios2/kernel/vmlinux.lds.S

index db9078f..e935377 100644

--- a/arch/nios2/kernel/vmlinux.lds.S

+++ b/arch/nios2/kernel/vmlinux.lds.S

@@ -57,6 +57,12 @@ SECTIONS

RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)

_edata = .;

+ .got : {

+ _GLOBAL_OFFSET_TABLE_ = .;

+ *(.got)

+ *(.got.plt)

+ }

+

BSS_SECTION(0, 0, 0)

_end = .;

- Hippo