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MediaTek BP firmware tools

File formats are defined with Kaitai. Files can be interactively explored with the Kaitai IDE using the ksy files.

Using XT2205-1_TESLA_TMO_12_S2STS32.71-118-4-2-6-3_subsidy-TMO_UNI_RSU_QCOM_regulatory-DEFAULT_cid50_CFC.xml.zip from https://mirrors.lolinet.com/firmware/lenomola/tesla/official/TMO/ as an example:

Firmware image

Extract contents of md1img.img:

$ ./md1_extract.py ../XT2205-1_TESLA_TMO_12_S2STS32.71-118-4-2-6-3_subsidy-TMO_UNI_RSU_QCOM_regulatory-DEFAULT_cid50_CFC/md1img.img --outdir ./md1img_out/
extracting files to: ./md1img_out
md1rom: addr=0x00000000, size=43084864
        extracted to 000_md1rom
cert1md: addr=0x12345678, size=1781
        extracted to 001_cert1md
cert2: addr=0x12345678, size=988
        extracted to 002_cert2
md1drdi: addr=0x00000000, size=12289536
        extracted to 003_md1drdi
cert1md: addr=0x12345678, size=1781
        extracted to 004_cert1md
cert2: addr=0x12345678, size=988
        extracted to 005_cert2
md1dsp: addr=0x00000000, size=6776460
        extracted to 006_md1dsp
cert1md: addr=0x12345678, size=1781
        extracted to 007_cert1md
cert2: addr=0x12345678, size=988
        extracted to 008_cert2
md1_filter: addr=0xffffffff, size=300
        extracted to 009_md1_filter
md1_filter_PLS_PS_ONLY: addr=0xffffffff, size=300
        extracted to 010_md1_filter_PLS_PS_ONLY
md1_filter_1_Moderate: addr=0xffffffff, size=300
        extracted to 011_md1_filter_1_Moderate
md1_filter_2_Standard: addr=0xffffffff, size=300
        extracted to 012_md1_filter_2_Standard
md1_filter_3_Slim: addr=0xffffffff, size=300
        extracted to 013_md1_filter_3_Slim
md1_filter_4_UltraSlim: addr=0xffffffff, size=300
        extracted to 014_md1_filter_4_UltraSlim
md1_filter_LowPowerMonitor: addr=0xffffffff, size=300
        extracted to 015_md1_filter_LowPowerMonitor
md1_emfilter: addr=0xffffffff, size=2252
        extracted to 016_md1_emfilter
md1_dbginfodsp: addr=0xffffffff, size=1635062
        extracted to 017_md1_dbginfodsp
md1_dbginfo: addr=0xffffffff, size=1332720
        extracted to 018_md1_dbginfo
md1_mddbmeta: addr=0xffffffff, size=899538
        extracted to 019_md1_mddbmeta
md1_mddbmetaodb: addr=0xffffffff, size=562654
        extracted to 020_md1_mddbmetaodb
md1_mddb: addr=0xffffffff, size=12280622
        extracted to 021_md1_mddb
md1_mdmlayout: addr=0xffffffff, size=8341403
        extracted to 022_md1_mdmlayout
md1_file_map: addr=0xffffffff, size=889
        extracted to 023_md1_file_map

Firmware is in the extracted md1rom file (000_md1rom). For nanoMIPS binaries, see the nanoMIPS Ghidra extension.

Debug symbols

mtk_dbg_extract.py takes symbols from md1_dbginfo (full filename given by md1_file_map) and outputs them in a text format that can be imported with Ghidra's ImportSymbolsScript.py script.

$ ./mtk_dbg_extract.py symbols DbgInfo_NR16.R2.MT6879.TC2.PR1.SP_LENOVO_S0MP1_K6879V1_64_MT6879_NR16_TC2_PR1_SP_V17_P38_03_24_03R_2023_05_19_22_31 | tee debug_symbols.txt
INT_Vectors 0x0000084c f
brom_ext_main 0x00000860 f
INT_SetPLL_Gen98 0x00000866 f
PLL_Set_CLK_To_26M 0x000009a2 f
PLL_MD_Pll_Init 0x000009da f
INT_SetPLL 0x000009dc f
INT_Initialize_Phase1 0x027b5c80 f
INT_Initialize_Phase2 0x027b617c f
init_cm 0x027b6384 f
init_cm_wt 0x027b641e f
...

Some debug info files, such as md1_dbginfodsp in the example firmware, contain symbols for multiple files. For now, the symbols for each file will be printed in sequence with a separator line beginning with #, e.g.:

# 0x000010 DSP_USIP0 
_ss_reset_entry 0x00000000 l
_vector_excpetion_veneer 0x00000404 l
...
# 0x081c4b DSP_USIP1 
_ss_reset_entry 0x00000000 l
_vector_excpetion_veneer 0x00000404 l
...
# 0x2cb407 DSP_SCQ16 SCQ16_LTE_ROCODE
void_lte_dmrs_comm_cell_info_trace___uint___uint 0x0003aff8 l
void_inv_cholesky_4x4_vst_func_Q3_VMLmvpvHalf_Q3_VMLmvpvHalf_Q3_VMLmvpvcHalf_Q3_VMLmvpvcHalf_Q3_VMLmvpvcHalf_Q3_VMLmvpvcHalf_Q3_VMLmvpvcHalf_Q3_VMLmvpvHalf_Q3_VMLmvpvHalf_Q3_VMLmvpvcHalf_Q3_VMLmvpsHalf___uint___uint___uint___uint___uint___uint___uint___uint___uint___uint___uint___uint___uint___uint___uint___uint 0x0004a5ab l
...

These comment lines are not supported by ImportSymbolsScript.py, so splitting must be done manually. (TODO: Option to output a symbol text file for each entry.)