Ive captured my latest kernel build for the Playstation 1. pre0 apparantly. I think Im getting somewhere, still no BU formatter tho.

minicom.cap

Loading R[23]00 MMU routines.
CPU revision is: 00000002
Primary instruction cache 4kb, linesize 4 bytes
Primary data cache 1kb, linesize 4 bytes
Linux version 2.4.0.0pre0 (codeasm@framework) (gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release)) #1 Sun Nov 3 09:35:52 PM CET 2024
Determined physical RAM map:
 memory: 00200000 @ 00000000 (usable)
On node 0 totalpages: 512
zone(0): 512 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: root=/dev/bu0 console=ttyS0
Console: mono PSXGPU console 78x21
Calibrating delay loop... 32.56 BogoMIPS
Memory: 1060k/2048k available (684k kernel code, 988k reserved, 29k data, 32k init)
Dentry-cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 1024 (order: 0, 4096 bytes)
Inode-cache hash table entries: 512 (order: 0, 4096 bytes)
Checking for 'wait' instruction...  unavailable.
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
ERROR<4>initialize_kbd: Keyboard failed self test
PSX SIO console enable 
PSX memory card: detecting card in slot 1 ...
bu_catch: card 1 catched
PSX memory card: check operation for card 1 timeout: st=0xd807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x1807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x2007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0xf807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0xd007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x1807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x9007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0xc007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x2807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x5807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: can't read 1 card first block
PSX memory card: card in slot 1 not found
PSX memory card: detecting card in slot 2 ...
bu_catch: card 2 catched
PSX memory card: check operation for card 2 timeout: st=0x7807,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: check operation for card 2 timeout: st=0x8807,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: check operation for card 2 timeout: st=0xb007,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: check operation for card 2 timeout: st=0xd007,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: check operation for card 2 timeout: st=0x9807,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: check operation for card 2 timeout: st=0xb007,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: check operation for card 2 timeout: st=0x9007,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: check operation for card 2 timeout: st=0xd007,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: check operation for card 2 timeout: st=0xd807,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: check operation for card 2 timeout: st=0x9807,status=0x1,hw_status=0x0,byte=0xff,control=0x3003,count=0
PSX memory card: can't read 2 card first block
PSX memory card: card in slot 2 not found
PSX memory card: driver for 2 cards initialized
Starting kswapd v1.8
PSX serial port driver
try to open 1 card (curr=-1, lock=0)
try to check card change
try to revalidate 1 card (curr=-1, lock=0)
bu_catch: card 1 catched
PSX memory card: check operation for card 1 timeout: st=0xf007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x2007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0xb807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x3007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x9007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0x6807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0xd007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0xa007,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: check operation for card 1 timeout: st=0xe807,status=0x1,hw_status=0x0,byte=0xff,control=0x1003,count=0
PSX memory card: can't read 1 card first block
PSX memory card: card in slot 1 not found
VFS: Cannot open root device "bu0" or cf:00
Please append a correct "root=" boot option
Kernel panic: VFS: Unable to mount root fs on cf:00