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pi@delta ~ $ tvservice -c "PAL 4:3"; fbset -depth 8; fbset -depth 16

Powering on SDTV with explicit settings (mode:2 aspect:1)

pi@delta ~ $ tvservice -p; fbset -depth 8; fbset -depth 16

Powering on HDMI with preferred settings

[링크 : https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=38020]

pi@raspberrypi ~ $ tvservice

Usage: tvservice [OPTION]...

  -p, --preferred                   Power on HDMI with preferred settings

  -e, --explicit="GROUP MODE DRIVE" Power on HDMI with explicit GROUP (CEA, DMT, CEA_3D_SBS, CEA_3D_TB, CEA_3D_FP)

                                      MODE (see --modes) and DRIVE (HDMI, DVI)

  -t, --ntsc                        Use NTSC frequency for HDMI mode (e.g. 59.94Hz rather than 60Hz)

  -c, --sdtvon="MODE ASPECT"        Power on SDTV with MODE (PAL or NTSC) and ASPECT (4:3 14:9 or 16:9)

  -o, --off                         Power off the display

  -m, --modes=GROUP                 Get supported modes for GROUP (CEA, DMT)

  -M, --monitor                     Monitor HDMI events

  -s, --status                      Get HDMI status

  -a, --audio                       Get supported audio information

  -d, --dumpedid <filename>         Dump EDID information to file

  -j, --json                        Use JSON format for --modes output

  -n, --name                        Print the device ID from EDID

  -h, --help                        Print this information 

-mmcu=architecture

Note that when only using -mmcu=architecture but no -mmcu=MCU type, including the file <avr/io.h> cannot work since it cannot decide which device's definitions to select.

Architecture Macros

avr5

AVR_ARCH=5

AVR_MEGA [5]

AVR_ENHANCED [5]

AVR_HAVE_JMP_CALL [4]

AVR_HAVE_MOVW [1]

AVR_HAVE_LPMX [1]

AVR_HAVE_MUL [1]

AVR_2_BYTE_PC [2]

avr51

AVR_ARCH=51

AVR_MEGA [5]

AVR_ENHANCED [5]

AVR_HAVE_JMP_CALL [4]

AVR_HAVE_MOVW [1]

AVR_HAVE_LPMX [1]

AVR_HAVE_MUL [1]

AVR_HAVE_RAMPZ [4]

AVR_HAVE_ELPM [4]

AVR_HAVE_ELPMX [4]

AVR_2_BYTE_PC [2]

-mmcu=MCU type

The following MCU types are currently understood by avr-gcc. The table matches them against the corresponding avr-gcc architecture name, and shows the preprocessor symbol declared by the -mmcu option. 

Architecture MCU name    Macro

avr5/avr51 [3] atmega128   __AVR_ATmega128__

#define AVR 1

#define __AVR 1

#define __AVR_ARCH__ 5

#define __AVR_ATmega128__ 1

#define __AVR_ENHANCED__ 1

#define __AVR_MEGA__ 1

#define __AVR__ 1

#define __CHAR_BIT__ 8

#define __DBL_DENORM_MIN__ 1.40129846e-45

#define __DBL_DIG__ 6

#define __DBL_EPSILON__ 1.19209290e-7

#define __DBL_HAS_INFINITY__ 1

#define __DBL_HAS_QUIET_NAN__ 1

#define __DBL_MANT_DIG__ 24

#define __DBL_MAX_10_EXP__ 38

#define __DBL_MAX_EXP__ 128

#define __DBL_MAX__ 3.40282347e+38

#define __DBL_MIN_10_EXP__ (-37)

#define __DBL_MIN_EXP__ (-125)

#define __DBL_MIN__ 1.17549435e-38

#define __DECIMAL_DIG__ 9

#define __FINITE_MATH_ONLY__ 0

#define __FLT_DENORM_MIN__ 1.40129846e-45F

#define __FLT_DIG__ 6

#define __FLT_EPSILON__ 1.19209290e-7F

#define __FLT_EVAL_METHOD__ 0

#define __FLT_HAS_INFINITY__ 1

#define __FLT_HAS_QUIET_NAN__ 1

#define __FLT_MANT_DIG__ 24

#define __FLT_MAX_10_EXP__ 38

#define __FLT_MAX_EXP__ 128

#define __FLT_MAX__ 3.40282347e+38F

#define __FLT_MIN_10_EXP__ (-37)

#define __FLT_MIN_EXP__ (-125)

#define __FLT_MIN__ 1.17549435e-38F

#define __FLT_RADIX__ 2

#define __GNUC_MINOR__ 1

#define __GNUC_PATCHLEVEL__ 0

#define __GNUC__ 4

#define __GXX_ABI_VERSION 1002

#define __INTMAX_MAX__ 9223372036854775807LL

#define __INTMAX_TYPE__ long long int

#define __INT_MAX__ 32767

#define __LDBL_DENORM_MIN__ 1.40129846e-45L

#define __LDBL_DIG__ 6

#define __LDBL_EPSILON__ 1.19209290e-7L

#define __LDBL_HAS_INFINITY__ 1

#define __LDBL_HAS_QUIET_NAN__ 1

#define __LDBL_MANT_DIG__ 24

#define __LDBL_MAX_10_EXP__ 38

#define __LDBL_MAX_EXP__ 128

#define __LDBL_MAX__ 3.40282347e+38L

#define __LDBL_MIN_10_EXP__ (-37)

#define __LDBL_MIN_EXP__ (-125)

#define __LDBL_MIN__ 1.17549435e-38L

#define __LONG_LONG_MAX__ 9223372036854775807LL

#define __LONG_MAX__ 2147483647L

#define __NO_INLINE__ 1

#define __PTRDIFF_TYPE__ int

#define __REGISTER_PREFIX__ 

#define __SCHAR_MAX__ 127

#define __SHRT_MAX__ 32767

#define __SIZE_TYPE__ unsigned int

#define __STDC_HOSTED__ 1

#define __STDC__ 1

#define __UINTMAX_TYPE__ long long unsigned int

#define __USER_LABEL_PREFIX__ 

#define __USING_SJLJ_EXCEPTIONS__ 1

#define __VERSION__ "4.1.0"

#define __WCHAR_MAX__ 32767

#define __WCHAR_TYPE__ int

#define __WINT_TYPE__ unsigned int