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Samsung "Midas" 4G

Midas is a code name that applies to several devices:
  • Galaxy SIII (GT-I9300)
  • Galaxy Note II (GT-N7100)
  • Galaxy SIII 4G (GT-I9305)
  • Galaxy Note II 4G (GT-N7105)

Modem firmware and hardware architecture

On both the Galaxy SIII 4G (GT-I9305) and Galaxy Note II 4G (GT-N7105), the AP (Samsung Exynos 4412) has partitions related to the modem:
Partition label Mount point Filesystem content
RADIO /firmware vfat modem firmware partition
EFS /efs ext4 modem data partition

Files inside the RADIO partition on the Galaxy SIII 4G (GT-I9305):

File Format Usage
acdb.mbn ?
apps.mbn ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, no section header
dsp1.mbn ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, no section header
dsp2.mbn ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, no section header
dsp3.mbn ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, no section header
efs1.mbn ?
efs2.mbn ?
efs3.mbn ?
mdm_acdb.img ?
modem_ds.ima ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, stripped
q6.mdt ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, no section header
rpm.mbn ?
sbl1.mbn ?
sbl2.mbn ?

The Replicant project has some information on the modem boot.

Though that page has also information on how to support that modem from Replicant which runs on the Samsung Exynos 4412.

Note that the AP part is also supported by upstream Linux with the exynos4412-i9305.dts for the Galaxy SIII 4G and exynos4412-n710x.dts for the Galaxy Note II 4G, assuming that you use u-boot and a nonfree BL1 (the stock bootloader doesn't clear the icache/dcache and still the MMU on). Else you need some small patches on top. See the Replicant 9 kenrel for such patches.

Modem Components for the Galaxy SIII 4G

Component type Component model
SOC Qualcomm MDM9615

TODO

  • Scan both devices PCB and upload it to archive.org to confirm the modem model with the markings (and not just the kernel configuration from the LineageOS kernel).
  • Look at the upstream support for the AP modem driver.
  • Look if the max77693 can route the modem to the USB connector through resistor values.
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