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커널 패닉 질문입니다.

lovejin0309의 이미지
글쓴이: lovejin0309 / 작성시간: 목, 2004/12/23 - 2:07오후

시스템 사양
CPU : PXA255A
ram : Samsung 32m
flash : Intel strata flash 16M (jffs2로 사용)
커널 : 2.4.18

임베디드 시스템을 공부중입니다.

Hybus사의 모델과 소스를 참조해서

bootloader, 커널, 파일 시스템(jffs2) 을 올려서 돌리면 잘 돌아가다가 다음과 같은 메세지를 출력한 후 죽어 버립니다.

혹시 원인과 해결 방법을 알 수 있을런지요. 아니면, 참고할 수 있는 자료나 책 추천 부탁드립니다. 이 것 때문에 고생이 많습니다. ㅜㅜ 

Unable to handle kernel NULL pointer dereference at virtual address 00000004
pgd = c1ef4000
*pgd = a1f34801, *pmd = a1f34801, *pte = 00000000, *ppte = 00000000
Internal error: Oops: ffffffff
CPU: 0
pc : [<c0085ab8>]    lr : [<60000013>]    Not tainted
sp : c1eefe98  ip : c03c8d80  fp : c1eefeac
r10: c1ac4660  r9 : 005a2000  r8 : 00000000
r7 : c0061100  r6 : 00000000  r5 : 000001f0  r4 : c01f45e0
r3 : 00000000  r2 : 00000000  r1 : c01f45e8  r0 : 00000800
Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  Segment user
Control: 397F  Table: A1EF4000  DAC: 00000015
Process tar (pid: 71, stackpage=c1eef000)
Stack: (0xc1eefe88 to 0xc1ef0000)
fe80:                   60000013 c0085ab8 20000093 ffffffff c0244140 005a2000
fea0: c1eeff0c c1eefeb0 c00e0da8 c0085a20 00000000 000001d2 00000000 00000800
fec0: c02d3acc c1ac4780 00000800 00000000 c0244140 0000e2f8 00951d08 00000800
fee0: 00000800 c0244140 005a2000 00000000 00000000 c1ac4660 00000000 00000800
ff00: c1eeff78 c1eeff10 c0082b84 c00e0c54 c0181ebc 41560000 00000800 c0244158
ff20: c02eeaf8 000005a2 c1ac46c8 00000800 00000000 00002000 c1ac4710 c1e39de0
ff40: 0202c4f0 c1e39dc0 00000000 00560000 00002800 c1e39dc0 ffffffea 00000000
ff60: 0202a4f0 c1eee000 00000030 c1eeffa4 c1eeff7c c008e8a8 c0082650 c0177004
ff80: c1eeffac 00002800 0202a4f0 00000000 00000004 c0062824 00000000 c1eeffa8
ffa0: c00626a0 c008e7d8 00002800 c01763d4 00000003 0202a4f0 00002800 02029fb4
ffc0: 00002800 0202a4f0 00000000 00000003 0000001c 00000000 00000030 bffffa18
ffe0: 0202983c bffff9f8 020153fc 400f85d4 20000010 00000003 0204e5a4 00000000
Backtrace:
Function entered at [<c0085a14>] from [<c00e0da8>]
 r5 = 005A2000  r4 = C0244140
Function entered at [<c00e0c48>] from [<c0082b84>]
Function entered at [<c0082644>] from [<c008e8a8>]
Function entered at [<c008e7cc>] from [<c00626a0>]
 r8 = C0062824  r7 = 00000004  r6 = 00000000  r5 = 0202A4F0
 r4 = 00002800
Code: e2843010 e15c0003 0a00001c e89c000c (e5823004)
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c1f40000
*pgd = a1f44001, *pmd = a1f44001, *pte = 00000000, *ppte = 00000000
Internal error: Oops: 0
CPU: 0
pc : [<00000000>]    lr : [<c0062f68>]    Not tainted
sp : c1f47e14  ip : c1f47e14  fp : c1f47e3c
r10: c01d0940  r9 : c1f47e40  r8 : c01c83d8
r7 : c01c8598  r6 : 00000000  r5 : 0000000e  r4 : c03d3620
r3 : 00000000  r2 : c1f47e40  r1 : 00000000  r0 : 0000000e
Flags: nZcv  IRQs on  FIQs on  Mode SVC_32  Segment user
Control: 397F  Table: A1F40000  DAC: 00000015
Process bash (pid: 51, stackpage=c1f47000)
Stack: (0xc1f47e04 to 0xc1f48000)
7e00:          c0062f68 00000000 40000013 ffffffff c1f47e74 f8d00000 00000100
7e20: c00f58c0 60000013 ffffffff c1f46000 c1f47ef4 c1f47e40 c0062300 c0062eb8
7e40: 00000012 00000001 f8100000 00000004 c02cd000 00000012 c1f47e88 00000013
7e60: 00000000 c03b55a0 c1f46000 c1f47ef4 00000057 c1f47e88 c01073cc c00f58c0
7e80: 60000013 ffffffff 6d676553 61746e65 6e6f6974 75616620 c00a746c 00000000
7ea0: c1f47ec8 c1f47eb0 c00686c0 c006859c a035e01f c0018120 c1f3f4a0 c1f46000
7ec0: a1d500bf c026a400 c1f47f04 c1f47ed8 c007cb18 c0068650 40016000 c02cd000
7ee0: 00000013 c1f47f0c c1f47f44 c1f47ef8 c00f768c c00f56dc 40016000 00000000
7f00: c1f46000 00000000 00000000 00000000 c1f46000 c02cd978 c02cd978 c02cd000
7f20: 00000000 00000013 c03b55a0 40016000 c00f7524 00000000 c1f47f78 c1f47f48
7f40: c00f2f30 c00f7530 00000013 40016000 00000013 c03b55a0 ffffffea 00000000
7f60: 40016000 c1f46000 4018b2fc c1f47fa4 c1f47f7c c008e8a8 c00f2d64 4018b2fc
7f80: c1f47fac 00000013 4018a444 40016000 00000004 c0062824 00000000 c1f47fa8
7fa0: c00626a0 c008e7d8 00000013 c0068408 00000002 40016000 00000013 4018a444
7fc0: 00000013 4018a444 40016000 00000013 00000001 02066ad5 4018b2fc bffff508
7fe0: 4018b3cc bffff4ec 400e7a60 401365d4 20000010 00000002 ffffffff ffffffff
Backtrace:
Function entered at [<c0062eac>] from [<c0062300>]
Function entered at [<c00f56d0>] from [<c00f768c>]
 r7 = C1F47F0C  r6 = 00000013  r5 = C02CD000  r4 = 40016000
Function entered at [<c00f7524>] from [<c00f2f30>]
Function entered at [<c00f2d58>] from [<c008e8a8>]
Function entered at [<c008e7cc>] from [<c00626a0>]
 r8 = C0062824  r7 = 00000004  r6 = 40016000  r5 = 4018A444
 r4 = 00000013
Code: bad PC value.
Kernel panic: Aiee, killing interrupt handler!
In interrupt handler - not syncing
 <1>Unable to handle kernel NULL pointer dereference at virtual address 00000000pgd = c1f40000
*pgd = a1f44001, *pmd = a1f44001, *pte = 00000000, *ppte = 00000000
Internal error: Oops: 0
CPU: 0
pc : [<00000000>]    lr : [<c0062f68>]    Not tainted
sp : c1f47c8c  ip : f8d00000  fp : c1f47cb4
r10: c01d0940  r9 : c1f47cb8  r8 : c01c83d8
r7 : c01c83d8  r6 : 00000000  r5 : 00000000  r4 : c03d3da0
r3 : 00000000  r2 : c1f47cb8  r1 : 00000000  r0 : 00000000
Flags: nZcv  IRQs on  FIQs on  Mode SVC_32  Segment user
Control: 397F  Table: A1F40000  DAC: 00000015
Process bash (pid: 51, stackpage=c1f47000)
Stack: (0xc1f47c7c to 0xc1f48000)
7c60:                                                                c0062f68
7c80: 00000000 40000013 ffffffff c1f47cec f8d00000 00000100 c006d3a4 60000013
7ca0: ffffffff c1f47dcc c1f47d0c c1f47cb8 c0062300 c0062eb8 00000000 00000000
7cc0: 00000000 c01e0ee8 c01cc45c c018bd40 0000000b 00000000 00000000 00000000
7ce0: c1f47dcc c1f47d0c c1f47d00 c1f47d00 c006d350 c006d3a4 60000013 ffffffff
7d00: c1f47d2c c1f47d20 c0070b78 c006d2c0 c018bd40 00000001 00000001 00000001
7d20: c1f47d48 c1f47d30 c0066ebc c0070b4c 00000000 c1f47dcc c0018120 c1f47d68
7d40: c1f47d4c c0067c9c c0066dc0 ffffffff c1f46000 00000000 c0018120 c1f47d9c
7d60: c1f47d6c c0068054 c0067c40 00000000 00000001 ffffffff 00000000 00000000
7d80: c01c8598 c01c83d8 40000013 c01d0940 c1f47db8 c1f47da0 c0068098 c0067f20
7da0: c1f47dd4 ffffffff c1f47e00 c1f47dc8 c1f47dbc c00684a4 c006807c c1f47e3c
7dc0: c1f47dcc c006241c c0068498 0000000e 00000000 c1f47e40 00000000 c03d3620
7de0: 0000000e 00000000 c01c8598 c01c83d8 c1f47e40 c01d0940 c1f47e3c c1f47e14
7e00: c1f47e14 c0062f68 00000000 40000013 ffffffff c1f47e74 f8d00000 00000100
7e20: c00f58c0 60000013 ffffffff c1f46000 c1f47ef4 c1f47e40 c0062300 c0062eb8
7e40: 00000012 00000001 f8100000 00000004 c02cd000 00000012 c1f47e88 00000013
7e60: 00000000 c03b55a0 c1f46000 c1f47ef4 00000057 c1f47e88 c01073cc c00f58c0
7e80: 60000013 ffffffff 6d676553 61746e65 6e6f6974 75616620 c00a746c 00000000
7ea0: c1f47ec8 c1f47eb0 c00686c0 c006859c a035e01f c0018120 c1f3f4a0 c1f46000
7ec0: a1d500bf c026a400 c1f47f04 c1f47ed8 c007cb18 c0068650 40016000 c02cd000
7ee0: 00000013 c1f47f0c c1f47f44 c1f47ef8 c00f768c c00f56dc 40016000 00000000
7f00: c1f46000 00000000 00000000 00000000 c1f46000 c02cd978 c02cd978 c02cd000
7f20: 00000000 00000013 c03b55a0 40016000 c00f7524 00000000 c1f47f78 c1f47f48
7f40: c00f2f30 c00f7530 00000013 40016000 00000013 c03b55a0 ffffffea 00000000
7f60: 40016000 c1f46000 4018b2fc c1f47fa4 c1f47f7c c008e8a8 c00f2d64 4018b2fc
7f80: c1f47fac 00000013 4018a444 40016000 00000004 c0062824 00000000 c1f47fa8
7fa0: c00626a0 c008e7d8 00000013 c0068408 00000002 40016000 00000013 4018a444
7fc0: 00000013 4018a444 40016000 00000013 00000001 02066ad5 4018b2fc bffff508
7fe0: 4018b3cc bffff4ec 400e7a60 401365d4 20000010 00000002 ffffffff ffffffff
Backtrace:
Function entered at [<c0062eac>] from [<c0062300>]
Function entered at [<c006d2b4>] from [<c0070b78>]
Function entered at [<c0070b40>] from [<c0066ebc>]
Function entered at [<c0066db4>] from [<c0067c9c>]
 r6 = C0018120  r5 = C1F47DCC  r4 = 00000000
Function entered at [<c0067c34>] from [<c0068054>]
 r7 = C0018120  r6 = 00000000  r5 = C1F46000  r4 = FFFFFFFF
Function entered at [<c0067f14>] from [<c0068098>]
Function entered at [<c0068070>] from [<c00684a4>]
 r5 = C1F47E00  r4 = FFFFFFFF
Function entered at [<c006848c>] from [<c006241c>]
Function entered at [<c0062eac>] from [<c0062300>]
Function entered at [<c00f56d0>] from [<c00f768c>]
 r7 = C1F47F0C  r6 = 00000013  r5 = C02CD000  r4 = 40016000
Function entered at [<c00f7524>] from [<c00f2f30>]
Function entered at [<c00f2d58>] from [<c008e8a8>]
Function entered at [<c008e7cc>] from [<c00626a0>]
 r8 = C0062824  r7 = 00000004  r6 = 40016000  r5 = 4018A444
 r4 = 00000013
Code: bad PC value.
Kernel panic: Aiee, killing interrupt handler!
In interrupt handler - not syncing
 <1>Unable to handle kernel paging request at virtual address c417b000
pgd = c1f40000
*pgd = a1d02021, *pmd = a1d02021, *pte = 00000000, *ppte = 00000000
Internal error: Oops: ffffffff
CPU: 0
pc : [<c4170080>]    lr : [<c0062f68>]    Not tainted
sp : c1f47abc  ip : 09c6b8d6  fp : c1f47ae4
r10: c01d0940  r9 : c1f47b30  r8 : c01c83d8
r7 : c01c8c58  r6 : 20000000  r5 : 00000044  r4 : c03bd860
r3 : c4170894  r2 : 000029dc  r1 : 000029db  r0 : c417078c
Flags: nzcv  IRQs off  FIQs on  Mode SVC_32  Segment user
Control: 397F  Table: A1F40000  DAC: 00000015
Process bash (pid: 51, stackpage=c1f47000)
Stack: (0xc1f47aac to 0xc1f48000)
7aa0:                            c0062f68 c4170080 00000093 ffffffff 00004000
7ac0: 0000000e c1f47b30 c01c8418 c01c83d8 c1f47b30 c01d0940 c1f47b00 c1f47ae8
7ae0: c0069fec c0062eb8 c01baf30 00000002 20000000 c1f47b2c c1f47b04 c0062f68
7b00: c0069ee8 c1f47b64 f8d00000 00000100 c006d3a4 60000013 ffffffff c1f47c44
7b20: c1f47b84 c1f47b30 c0062300 c0062eb8 00000000 00000000 00000000 c01e0ee8
7b40: c01cc45c c018bd40 0000000b 00000000 00000000 00000000 c1f47c44 c1f47b84
7b60: c1f47b78 c1f47b78 c006d350 c006d3a4 60000013 ffffffff c1f47ba4 c1f47b98
7b80: c0070b78 c006d2c0 c018bd40 00000001 00000002 00000002 c1f47bc0 c1f47ba8
7ba0: c0066ebc c0070b4c 00000000 c1f47c44 c0018120 c1f47be0 c1f47bc4 c0067c9c
7bc0: c0066dc0 ffffffff c1f46000 00000000 c0018120 c1f47c14 c1f47be4 c0068054
7be0: c0067c40 c01c8418 00000001 ffffffff 00000000 00000000 c01c83d8 c01c83d8
7c00: 40000013 c01d0940 c1f47c30 c1f47c18 c0068098 c0067f20 c1f47c88 ffffffff
7c20: c1f47c78 c1f47c40 c1f47c34 c00684a4 c006807c c1f47cb4 c1f47c44 c006241c
7c40: c0068498 00000000 00000000 c1f47cb8 00000000 c03d3da0 00000000 00000000
7c60: c01c83d8 c01c83d8 c1f47cb8 c01d0940 c1f47cb4 f8d00000 c1f47c8c c0062f68
7c80: 00000000 40000013 ffffffff c1f47cec f8d00000 00000100 c006d3a4 60000013
7ca0: ffffffff c1f47dcc c1f47d0c c1f47cb8 c0062300 c0062eb8 00000000 00000000
7cc0: 00000000 c01e0ee8 c01cc45c c018bd40 0000000b 00000000 00000000 00000000
7ce0: c1f47dcc c1f47d0c c1f47d00 c1f47d00 c006d350 c006d3a4 60000013 ffffffff
7d00: c1f47d2c c1f47d20 c0070b78 c006d2c0 c018bd40 00000001 00000001 00000001
7d20: c1f47d48 c1f47d30 c0066ebc c0070b4c 00000000 c1f47dcc c0018120 c1f47d68
7d40: c1f47d4c c0067c9c c0066dc0 ffffffff c1f46000 00000000 c0018120 c1f47d9c
7d60: c1f47d6c c0068054 c0067c40 00000000 00000001 ffffffff 00000000 00000000
7d80: c01c8598 c01c83d8 40000013 c01d0940 c1f47db8 c1f47da0 c0068098 c0067f20
7da0: c1f47dd4 ffffffff c1f47e00 c1f47dc8 c1f47dbc c00684a4 c006807c c1f47e3c
7dc0: c1f47dcc c006241c c0068498 0000000e 00000000 c1f47e40 00000000 c03d3620
7de0: 0000000e 00000000 c01c8598 c01c83d8 c1f47e40 c01d0940 c1f47e3c c1f47e14
7e00: c1f47e14 c0062f68 00000000 40000013 ffffffff c1f47e74 f8d00000 00000100
7e20: c00f58c0 60000013 ffffffff c1f46000 c1f47ef4 c1f47e40 c0062300 c0062eb8
7e40: 00000012 00000001 f8100000 00000004 c02cd000 00000012 c1f47e88 00000013
7e60: 00000000 c03b55a0 c1f46000 c1f47ef4 00000057 c1f47e88 c01073cc c00f58c0
7e80: 60000013 ffffffff 6d676553 61746e65 6e6f6974 75616620 c00a746c 00000000
7ea0: c1f47ec8 c1f47eb0 c00686c0 c006859c a035e01f c0018120 c1f3f4a0 c1f46000
7ec0: a1d500bf c026a400 c1f47f04 c1f47ed8 c007cb18 c0068650 40016000 c02cd000
7ee0: 00000013 c1f47f0c c1f47f44 c1f47ef8 c00f768c c00f56dc 40016000 00000000
7f00: c1f46000 00000000 00000000 00000000 c1f46000 c02cd978 c02cd978 c02cd000
7f20: 00000000 00000013 c03b55a0 40016000 c00f7524 00000000 c1f47f78 c1f47f48
7f40: c00f2f30 c00f7530 00000013 40016000 00000013 c03b55a0 ffffffea 00000000
7f60: 40016000 c1f46000 4018b2fc c1f47fa4 c1f47f7c c008e8a8 c00f2d64 4018b2fc
7f80: c1f47fac 00000013 4018a444 40016000 00000004 c0062824 00000000 c1f47fa8
7fa0: c00626a0 c008e7d8 00000013 c0068408 00000002 40016000 00000013 4018a444
7fc0: 00000013 4018a444 40016000 00000013 00000001 02066ad5 4018b2fc bffff508
7fe0: 4018b3cc bffff4ec 400e7a60 401365d4 20000010 00000002 ffffffff ffffffff
Backtrace:
Function entered at [<c0062eac>] from [<c0069fec>]
Function entered at [<c0069edc>] from [<c0062f68>]
 r6 = 20000000  r5 = 00000002  r4 = C01BAF30
Function entered at [<c0062eac>] from [<c0062300>]
Function entered at [<c006d2b4>] from [<c0070b78>]
Function entered at [<c0070b40>] from [<c0066ebc>]
Function entered at [<c0066db4>] from [<c0067c9c>]
 r6 = C0018120  r5 = C1F47C44  r4 = 00000000
Function entered at [<c0067c34>] from [<c0068054>]
 r7 = C0018120  r6 = 00000000  r5 = C1F46000  r4 = FFFFFFFF
Function entered at [<c0067f14>] from [<c0068098>]
Function entered at [<c0068070>] from [<c00684a4>]
 r5 = C1F47C78  r4 = FFFFFFFF
Function entered at [<c006848c>] from [<c006241c>]
Function entered at [<c0062eac>] from [<c0062300>]
Function entered at [<c006d2b4>] from [<c0070b78>]
Function entered at [<c0070b40>] from [<c0066ebc>]
Function entered at [<c0066db4>] from [<c0067c9c>]
 r6 = C0018120  r5 = C1F47DCC  r4 = 00000000
Function entered at [<c0067c34>] from [<c0068054>]
 r7 = C0018120  r6 = 00000000  r5 = C1F46000  r4 = FFFFFFFF
Function entered at [<c0067f14>] from [<c0068098>]
Function entered at [<c0068070>] from [<c00684a4>]
 r5 = C1F47E00  r4 = FFFFFFFF
Function entered at [<c006848c>] from [<c006241c>]
Function entered at [<c0062eac>] from [<c0062300>]
Function entered at [<c00f56d0>] from [<c00f768c>]
 r7 = C1F47F0C  r6 = 00000013  r5 = C02CD000  r4 = 40016000
Function entered at [<c00f7524>] from [<c00f2f30>]
Function entered at [<c00f2d58>] from [<c008e8a8>]
Function entered at [<c008e7cc>] from [<c00626a0>]
 r8 = C0062824  r7 = 00000004  r6 = 40016000  r5 = 4018A444
 r4 = 00000013
Code: e593c010 e59f3010 e2812001 e5802000 (e783c101)
Kernel panic: Aiee, killing interrupt handler!
In interrupt handler - not syncing

코드는 길지만, 좀 부탁드리겠습니다.

pc : [<4002d720>]    lr : [<4004a7bc>]    Not tainted
sp : bffffa54  ip : 0002d198  fp : bffffa70
r10: 400667a8  r9 : 00000001  r8 : 00000000
r7 : 02080634  r6 : 0208acac  r5 : 00000000  r4 : 0208498c
r3 : 020849b0  r2 : bffffa54  r1 : 00000001  r0 : 0208acac
Flags: nZCv  IRQs on  FIQs on  Mode USER_32  Segment user
Control: 397F  Table: A1F24000  DAC: 00000015

그리고 가끔씩 로그인을 할 때, 위와 같은 메세지가 뜨면서 로그인이 안 되는 경우가 있습니다.

Forums: 
프로그래밍 QnA
flyduck의 이미지

글쓴이: flyduck / 작성시간: 금, 2004/12/24 - 4:36오전

여러개의 kernel oops 메시지 중에서 중요한 건 맨 처음 것입니다.

> Unable to handle kernel NULL pointer dereference at virtual address 00000004

커널 코드에서 null pointer에 접근해서 panic이 발생하였습니다.

> pc : [<c0085ab8>] lr : [<60000013>] Not tainted

System.map 파일에서 c0085ab8이 무슨 함수인지 찾아보세요.
그러면 어느 함수에서 에러가 발생했는지 알 수 있습니다.

> Function entered at [<c0085a14>] from [<c00e0da8>]
r5 = 005A2000 r4 = C0244140
> Function entered at [<c00e0c48>] from [<c0082b84>]
> Function entered at [<c0082644>] from [<c008e8a8>]
> Function entered at [<c008e7cc>] from [<c00626a0>]

각 주소를 찾아보면 어떤 순서로 함수가 불렸는지 알 수 있습니다.

그러면 앞에서 찾은 함수에서 왜 null pointer 접근이 일어났는지 찾아서 디버깅을 하시기 바랍니다.

Freedom is another word for nothing left to lose,
Nothing doesn't mean nothing if it ain't free.

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  • 사용할 수 있는 HTML 태그: <p><div><span><br><a><em><strong><del><ins><b><i><u><s><pre><code><cite><blockquote><ul><ol><li><dl><dt><dd><table><tr><td><th><thead><tbody><h1><h2><h3><h4><h5><h6><img><embed><object><param><hr>
  • 다음 태그를 이용하여 소스 코드 구문 강조를 할 수 있습니다: <code>, <blockcode>, <apache>, <applescript>, <autoconf>, <awk>, <bash>, <c>, <cpp>, <css>, <diff>, <drupal5>, <drupal6>, <gdb>, <html>, <html5>, <java>, <javascript>, <ldif>, <lua>, <make>, <mysql>, <perl>, <perl6>, <php>, <pgsql>, <proftpd>, <python>, <reg>, <spec>, <ruby>. 지원하는 태그 형식: <foo>, [foo].
  • web 주소와/이메일 주소를 클릭할 수 있는 링크로 자동으로 바꿉니다.

BBCode

  • 텍스트에 BBCode 태그를 사용할 수 있습니다. URL은 자동으로 링크 됩니다.
  • 다음 태그를 이용하여 소스 코드 구문 강조를 할 수 있습니다: <code>, <blockcode>, <apache>, <applescript>, <autoconf>, <awk>, <bash>, <c>, <cpp>, <css>, <diff>, <drupal5>, <drupal6>, <gdb>, <html>, <html5>, <java>, <javascript>, <ldif>, <lua>, <make>, <mysql>, <perl>, <perl6>, <php>, <pgsql>, <proftpd>, <python>, <reg>, <spec>, <ruby>. 지원하는 태그 형식: <foo>, [foo].
  • 사용할 수 있는 HTML 태그: <p><div><span><br><a><em><strong><del><ins><b><i><u><s><pre><code><cite><blockquote><ul><ol><li><dl><dt><dd><table><tr><td><th><thead><tbody><h1><h2><h3><h4><h5><h6><img><embed><object><param>
  • web 주소와/이메일 주소를 클릭할 수 있는 링크로 자동으로 바꿉니다.

Textile

  • 다음 태그를 이용하여 소스 코드 구문 강조를 할 수 있습니다: <code>, <blockcode>, <apache>, <applescript>, <autoconf>, <awk>, <bash>, <c>, <cpp>, <css>, <diff>, <drupal5>, <drupal6>, <gdb>, <html>, <html5>, <java>, <javascript>, <ldif>, <lua>, <make>, <mysql>, <perl>, <perl6>, <php>, <pgsql>, <proftpd>, <python>, <reg>, <spec>, <ruby>. 지원하는 태그 형식: <foo>, [foo].
  • You can use Textile markup to format text.
  • 사용할 수 있는 HTML 태그: <p><div><span><br><a><em><strong><del><ins><b><i><u><s><pre><code><cite><blockquote><ul><ol><li><dl><dt><dd><table><tr><td><th><thead><tbody><h1><h2><h3><h4><h5><h6><img><embed><object><param><hr>

Markdown

  • 다음 태그를 이용하여 소스 코드 구문 강조를 할 수 있습니다: <code>, <blockcode>, <apache>, <applescript>, <autoconf>, <awk>, <bash>, <c>, <cpp>, <css>, <diff>, <drupal5>, <drupal6>, <gdb>, <html>, <html5>, <java>, <javascript>, <ldif>, <lua>, <make>, <mysql>, <perl>, <perl6>, <php>, <pgsql>, <proftpd>, <python>, <reg>, <spec>, <ruby>. 지원하는 태그 형식: <foo>, [foo].
  • Quick Tips:
    • Two or more spaces at a line's end = Line break
    • Double returns = Paragraph
    • *Single asterisks* or _single underscores_ = Emphasis
    • **Double** or __double__ = Strong
    • This is [a link](http://the.link.example.com "The optional title text")
    For complete details on the Markdown syntax, see the Markdown documentation and Markdown Extra documentation for tables, footnotes, and more.
  • web 주소와/이메일 주소를 클릭할 수 있는 링크로 자동으로 바꿉니다.
  • 사용할 수 있는 HTML 태그: <p><div><span><br><a><em><strong><del><ins><b><i><u><s><pre><code><cite><blockquote><ul><ol><li><dl><dt><dd><table><tr><td><th><thead><tbody><h1><h2><h3><h4><h5><h6><img><embed><object><param><hr>

Plain text

  • HTML 태그를 사용할 수 없습니다.
  • web 주소와/이메일 주소를 클릭할 수 있는 링크로 자동으로 바꿉니다.
  • 줄과 단락은 자동으로 분리됩니다.
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