Hello,

I was trying to debootstrap Debian stretch on a MIPS machine, and
apparently it fails with "Illegal instruction" error.

Would you please tell me what is missing in my proceessor? It's a
Mediatek MT7628ANN SoC, here goes cat /proc/cpuinfo output:

root@OpenWrt:/mnt/sda2# cat /proc/cpuinfo
system type : MediaTek MT7628AN ver:1 eco:2
machine : TP-Link TL-MR3420 v5
processor : 0
cpu model : MIPS 24KEc V5.5
BogoMIPS : 385.84
wait instruction : yes
microsecond timers : yes
tlb_entries : 32
extra interrupt vector : yes
hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa : mips1 mips2 mips32r1 mips32r2
ASEs implemented : mips16 dsp
shadow register sets : 1
kscratch registers : 0
package : 0
core : 0
VCED exceptions : not available
VCEI exceptions : not available


I was trying both mips and mipsel release, but it seems like mipsel is
the correct one (at least ELF architecture ID is the same). Is it
possible to run any Debian release on this machine?

Thanks in advance!

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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Hi,

On 25/04/18 22:28, Michael Krylov wrote:

Hello,

I was trying to debootstrap Debian stretch on a MIPS machine, and
apparently it fails with "Illegal instruction" error.

Would you please tell me what is missing in my proceessor? It's a
Mediatek MT7628ANN SoC, here goes cat /proc/cpuinfo output:

root@OpenWrt:/mnt/sda2# cat /proc/cpuinfo
system type : MediaTek MT7628AN ver:1 eco:2
machine : TP-Link TL-MR3420 v5
processor : 0
cpu model : MIPS 24KEc V5.5

Does your kernel have FPU emulation enabled? 24KEc does not have an FPU
so the kernel will need to emulate it. Usually the stock OpenWRT kernels
are compiled without it and will not run Debian.

I was trying both mips and mipsel release, but it seems like mipsel is
the correct one (at least ELF architecture ID is the same). Is it
possible to run any Debian release on this machine?

mipsel should work for you.

James

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Indeed it doesn't have CONFIG_MIPS_FPU_EMULATOR enabled in
kernel config.

Thanks!

On Wed, Apr 25, 2018 at 10:51:18PM +0100, James Cowgill wrote:

Hi,

On 25/04/18 22:28, Michael Krylov wrote:

Hello,

I was trying to debootstrap Debian stretch on a MIPS machine, and apparently it fails with "Illegal instruction" error.

Would you please tell me what is missing in my proceessor? It's a
Mediatek MT7628ANN SoC, here goes cat /proc/cpuinfo output:

root@OpenWrt:/mnt/sda2# cat /proc/cpuinfo
system type : MediaTek MT7628AN ver:1 eco:2
machine : TP-Link TL-MR3420 v5
processor : 0
cpu model : MIPS 24KEc V5.5

Does your kernel have FPU emulation enabled? 24KEc does not have an FPU
so the kernel will need to emulate it. Usually the stock OpenWRT kernels
are compiled without it and will not run Debian.

I was trying both mips and mipsel release, but it seems like mipsel is
the correct one (at least ELF architecture ID is the same). Is it
possible to run any Debian release on this machine?

mipsel should work for you.

James

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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)