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Re: [PATCH]: for poor sools with old I2 & 64 bits kernel

To: Thiemo Seufer <>
Subject: Re: [PATCH]: for poor sools with old I2 & 64 bits kernel
From: Juan Quintela <>
Date: 19 Dec 2002 22:40:55 +0100
Cc: Ralf Baechle <>, mipslist <>
In-reply-to: <>
Original-recipient: rfc822;
References: <m2el8dixmr.fsf@demo.mitica> <> <m2wum5hfy2.fsf@demo.mitica> <>
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2.92
>>>>> "thiemo" == Thiemo Seufer <> writes:

thiemo> Juan Quintela wrote:
>> >>>>> "thiemo" == Thiemo Seufer <> writes:
thiemo> Juan Quintela wrote:
>> >> 
>> >> Hi
>> >> this small patch made possible to compile a 64bit kernel for
>> >> people that have old proms that only accept ecoff.  As usual
>> >> stolen from the 32 bits version.
>> >> 
>> >> The easiest way is creating the file in arch/mips/boot,
>> >> otherwise we need to copy elf2ecoff.c to mips64.
thiemo> Sorry, but I plainly doubt you have tested this.
thiemo> I tried such a method today, and elf2ecoff failed to work on ELF64 
thiemo> Maybe a recent enough objcopy is the better choice for this purpose.
>> I tested it and it works :)

thiemo> How is this possible, given that elf2ecoff uses Elf32_* variables to
thiemo> process the ELF file? elf2ecoff might be bad enough at error checking
thiemo> to produce some binary garbage.

>> Notice that I am using egcs for MIPS64 as I am not able to compile the
>> kernel with gcc-3.2 :(

thiemo> I don't think this is compiler dependent. :-)

from  arch/mips64/Makefile:

# Some machines like the Indy need 32-bit ELF binaries for booting purposes.
# Other need ECOFF, so we build a 32-bit ELF binary for them which we then
# convert to ECOFF using elf2ecoff.
GCCFLAGS += -Wa,-32 $(shell if $(CC) -Wa,-mgp64 -c -o /dev/null -xc /dev/null > 
/dev/null 2>&1; then echo "-Wa,-mgp64"; fi)
LINKFLAGS += -T arch/mips64/ld.script.elf32

In theory, practice and theory are the same, but in practice they 
are different -- Larry McVoy

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