CLFS for a AMD ELAN SC520 target

Felix Brack fb at ltec.ch
Tue Nov 8 01:55:10 PST 2005


Matt Darcy wrote:

MD> Jim Gifford wrote:

>> The target sanity checks are the only thing that can help you, but you 
>> do have everything setup if your host is a Athlon like you say you 
>> would set
>>
>> export LFS_HOST="${MACHTYPE}"
>>
>> for your target
>>
>> export LFS_TARGET="i586-pc-linux-gnu"
>>
>> Then just do the sanity check which is on the bottom of the page.
>>
>> if [ "${LFS_HOST}" = "${LFS_TARGET}" ]; then \
>>  echo "Host and Target can't be the same." ; fi
>>
>>
MD> If I remember correctly on this, the elan arch needs to be set in the 
MD> kernel for the target system as it uses a slightly different subsystem
MD> (I could be wrong on this)

MD> I'd certainly check this before deciding to chroot (impossible if I'm 
MD> right and your host isn't an elan based distro) or boot.

MD> Matt



You are right: the ELAN arch must be set in the kernel. This works and
the kernel just boots fine. At the very end, the last job done by the
kernel is loading init and this fails. I do not see why because there
is no output but I am quite sure that init segfaults.

If I take an image of the new CLFS system and replace the kernel
temporarily with one that executes on my _host_ (AMD Athlon) this is
fine. Following is the boot log on the target starting from grub and
ending with the kernel calling init:

=============================
  Booting 'LFS-Base'

root (hd0,0)
 Filesystem type is ext2fs, partition type 0x83
kernel /boot/bzImage-2.6.12.6 root=/dev/hda1 console=ttyS1,115200
   [Linux-bzImage, setup=0x1200, size=0x1099c2]
boot
Linux version 2.6.12.6 (root at raptor) (gcc version 4.0.2) #5 Mon Nov 7 11:52:32 CET 2005
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
 BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 0000000001000000 (usable)
 BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)
16MB LOWMEM available.
DMI not present.
Allocating PCI resources starting at 01000000 (gap: 01000000:fef00000)
Built 1 zonelists
Kernel command line: root=/dev/hda1 console=ttyS1,115200
Initializing CPU#0
PID hash table entries: 128 (order: 7, 2048 bytes)
Using pit for high-res timesource
Console: colour dummy device 80x25
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 13568k/16384k available (1381k kernel code, 2404k reserved, 621k data, 104k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Mount-cache hash table entries: 512
CPU: AMD 486 DX/4-WB stepping 04
Checking 'hlt' instruction... OK.
NET: Registered protocol family 16
PCI: PCI BIOS revision 2.10 entry at 0xf9b89, last bus=1
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing disabled
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A
ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
hda: STI Flash 7.0.0, CFA DISK drive
ide2: I/O resource 0x3EE-0x3EE not free.
ide2: ports already in use, skipping probe
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: max request size: 128KiB
hda: 501760 sectors (256 MB), CHS=980/16/32
hda: cache flushes not supported
 hda: hda1
mice: PS/2 mouse device common for all mice
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP established hash table entries: 1024 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
NET: Registered protocol family 1
NET: Registered protocol family 17
 hda: hda1
 hda: hda1
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 104k freed
=======================================

At least the line "CPU: AMD 486 DX/4-WB stepping 04" looks very
strange. This is why I am not sure anymore if my target triplet is
correct.

Felix







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