XIP kernel(2.6.11 with MTD) fail in compiling

XIP kernel(2.6.11 with MTD) fail in compiling

[Chen,Xi]

Hello,

I'm working on a PXA-272 based development board and trying to enable a 
XIP kernel for it.
The root file system needs to be JFFS2, so MTD support should be 
included. When I tried to
boot the kernel, it stalled at that message:
===============================================
......
eth0: cs8900 rev K found at 0xf0000300 no EEPROM
cs89x0: No EEPROM, relying on command line....
cs89x0 media RJ-45, IRQ 41, programmed I/O, MAC 00:0b:f4:2f:9b:e5
Probing flash0 at physical address 0x00000000 (32-bit bankwidth)
===============================================

I found an option in kernel configuration, named "MTD_XIP" and it seemed 
a solution.
I also added a "-mlong-calls" option to CFLAGS when XIP enabled, in case 
some function
calls exceeded the PC24 limitation in ARM.
Compilation errors occured like that:
===============================================
drivers/built-in.o(.text+0x59130): In function `cfi_intelext_write_words':
: relocation truncated to fit: R_ARM_PC24 .data
drivers/built-in.o(.text+0x591bc): In function `cfi_intelext_write_words':
: relocation truncated to fit: R_ARM_PC24 .data
drivers/built-in.o(.text+0x59270): In function `cfi_intelext_write_words':
: relocation truncated to fit: R_ARM_PC24 .data
drivers/built-in.o(.text+0x593e4): In function `cfi_intelext_write_buffers':
: relocation truncated to fit: R_ARM_PC24 .data
drivers/built-in.o(.data+0x8a40): In function `do_xxlock_oneblock':
: relocation truncated to fit: R_ARM_PC24 .text
drivers/built-in.o(.data+0x8aa4): In function `do_xxlock_oneblock':
: relocation truncated to fit: R_ARM_PC24 .text
drivers/built-in.o(.data+0x8d14): In function `do_xxlock_oneblock':
: relocation truncated to fit: R_ARM_PC24 .text
drivers/built-in.o(.data+0x8dbc): In function `do_xxlock_oneblock':
: relocation truncated to fit: R_ARM_PC24 .text
drivers/built-in.o(.data+0x8eb4): In function `do_write_oneword':
: relocation truncated to fit: R_ARM_PC24 .text
drivers/built-in.o(.data+0x8f38): In function `do_write_oneword':
: relocation truncated to fit: R_ARM_PC24 .text
drivers/built-in.o(.data+0x92e4): In function `do_write_oneword':
: additional relocation overflows omitted from the output
make: *** [.tmp_vmlinux1] Error 1
===============================================

Anyone knows why the linker still complains, even with "-mlong-calls" used?

My cross compile toolchain versions:
arm-linux-gcc 3.4.3
binutils 2.16
And some basic info about my memory layout:
flash memory start from 0x00000000, 64MB
SDRAM start from 0xa0000000, 64MB

Thanks a lot for your time.

Chen,Xi

Re: XIP kernel(2.6.11 with MTD) fail in compiling

[Nicolas Pitre]

On Thu, 1 Jun 2006, Chen,Xi wrote:

> Hello,
> 
> I'm working on a PXA-272 based development board and trying to enable a 
> XIP kernel for it.

Please try a later kernel.

> I found an option in kernel configuration, named "MTD_XIP" and it seemed 
> a solution.

It is mandatory if you want to use MTD with a XIP kernel.

> I also added a "-mlong-calls" option to CFLAGS when XIP enabled, in case 
> some function
> calls exceeded the PC24 limitation in ARM.

This is unnecessary.  The XIP kernel is already properly located in 
memory so to not exceed linkage requirements on ARM.


Nicolas