LimHD:EXT2: Difference between revisions
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I also need to compile '''e2fsck''' and run it at boot. Maybe even '''mke2fs''' because I am nice. | I also need to compile '''e2fsck''' and run it at boot. Maybe even '''mke2fs''' because I am nice. | ||
=== read-only === | |||
/dev/ide/host0/bus0/target0/lun0/part1 on /mnt/HD1 type ext2 (ro,nosuid) | /dev/ide/host0/bus0/target0/lun0/part1 on /mnt/HD1 type ext2 (ro,nosuid) | ||
Alas, it is mounted '''read-only'''. I need to find this option next. | Alas, it is mounted '''read-only'''. I need to find this option next. | ||
#define MS_RDONLY 1 /* Mount read-only */ | |||
#define MS_NOSUID 2 /* Ignore suid and sgid bits */ | |||
So, most likely there is a '''3''' somewhere. Probably in '''R4'''. | |||
Unfortunately, the mount commands does a: | |||
LDR R4, [R11, #arg_4] | |||
Just before it calls sys_mount. So, I have to chase down where this is set. That isn't as easy. | |||
Revision as of 02:49, 17 October 2007
ext2
Since I only use OsX at home, and do not really use Windows, it does not make much sense to use NTFS on the internal HDD. The Linux kernel has ext2 support, and since the limits of ext2 are quite acceptable [1] I formatted it ext2 with block size of 2048.
As it turns out, I actually had a lot of other problems, in that the HDD stops working after being on for about 10 minutes. Usually with "lost interrupt", "resetting MBUS" messages. Either the HDD is bad and dying, or my LimHD200i is bad. Either way, since I want a writable HDD, and run FTP and SMB, ext2 makes much more sense.
But, curacao does not recognise ext2 on the internal HDD. Only vfat and ntfs. The check for that is located here:
xseg000:000568A4 loc_568A4 ; CODE XREF: print_mounted+C8vj xseg000:000568A4 MOV R0, R7 ; loops here until R5 is 10 xseg000:000568A8 LDR R1, =aDevIdeHost0Bus ; Load from Memory xseg000:000568AC MOV R2, R5 ; Rd = Op2 xseg000:000568B0 BL sprintf_2A3314 ; R1 = /dev/ide/%R5 (R2) xseg000:000568B4 MOV R0, R6 ; R6 = /dev/ide/host%d xseg000:000568B8 LDR R1, =aMntHdD ; Load from Memory xseg000:000568BC MOV R2, R5 ; Rd = Op2 xseg000:000568C0 BL sprintf_2A3314 ; /mnt/HD%R5 xseg000:000568C4 LDR R3, =aIocharsetUtf8_0 ; Load from Memory xseg000:000568C8 STR R3, [SP,#0x88+var_88] ; Store to Memory xseg000:000568CC MOV R0, R7 ; Rd = Op2 xseg000:000568D0 MOV R1, R6 ; Rd = Op2 xseg000:000568D4 LDR R2, =aVfat_0 ; Load from Memory xseg000:000568D8 MOV R3, #7 ; Rd = Op2 xseg000:000568DC BL testfstype_2A9E1C ; Branch with Link xseg000:000568E0 CMP R0, #0 ; Set cond. codes on Op1 - Op2 xseg000:000568E4 BEQ loc_5690C ; Branch xseg000:000568E8 LDR R3, =aNlsUtf8 ; Load from Memory xseg000:000568EC STR R3, [SP,#0x88+var_88] ; Store to Memory xseg000:000568F0 SUB R0, R11, #0x60 ; Rd = Op1 - Op2 xseg000:000568F4 SUB R1, R11, #0x80 ; Rd = Op1 - Op2 xseg000:000568F8 LDR R2, =aNtfs_0 ; Load from Memory xseg000:000568FC MOV R3, #7 ; Rd = Op2 xseg000:00056900 BL testfstype_2A9E1C ; Branch with Link xseg000:00056904 CMP R0, #0 ; Set cond. codes on Op1 - Op2 xseg000:00056908 BNE loc_56934 ; Branch
Basically, it looks for partition type #7 which is HPFS/NTFS, tries to mount it with strings vfat and iocharset=utf8. If that fails, it tries #7 with ntfs and nls=utf8. The partition type for Linux should be #83, and changing ntfs to ext2 will result in:
EXT2-fs: Unrecognized mount option nls=utf8
So, we need to replace the mount option nls=utf8 as well. According to linux-2.4.22-em86xx/fs/ext2/super.c we can chose from:
bsddf nouid32 check debug errors=continue/remount-ro/panic) grpid bsdgroups minixdf nocheck nogrpid sysvgroups resgid resuid sb grpquota noquota quota usrquota
I went with nocheck for now. There are a few in there that would be relatively harmless.
The next problem is restarting curacao. It needs to be shut down in such a way that we can open /dev/ir again, which is only allowed to be opened once.
First you kill the curacao process, usually the lowest pid. Then you should kill all the udhcpc processes, (I used highest pid to lowest order, does this matter?) and if you ran cat /proc/kmsg & before then, you should get this message:
<7>ir: Disable NEC decoder <7>ir: Disable RC5 decoder <7>ir: Disable RC6 decoder
Sweet, now you can start curacao again, I use Samba mount.
/mnt/smbfs/curacao-ext2 /mnt /dev/ir
I can not provide the patched binary of curacao sorry!
Naturally, eventually I will roll my own firmware with my version of curacao but you really want to make sure it works before you do that, since without a working curacao you can not flash a new firmware!. This is why I did it this way for now.
I also need to compile e2fsck and run it at boot. Maybe even mke2fs because I am nice.
read-only
/dev/ide/host0/bus0/target0/lun0/part1 on /mnt/HD1 type ext2 (ro,nosuid)
Alas, it is mounted read-only. I need to find this option next.
#define MS_RDONLY 1 /* Mount read-only */ #define MS_NOSUID 2 /* Ignore suid and sgid bits */
So, most likely there is a 3 somewhere. Probably in R4.
Unfortunately, the mount commands does a:
LDR R4, [R11, #arg_4]
Just before it calls sys_mount. So, I have to chase down where this is set. That isn't as easy.