Samsung Midas 4G » History » Version 14
gnutoo, 02/03/2020 07:43 PM
Explain midas
| 1 | 14 | gnutoo | h1. Samsung "Midas" 4G |
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| 2 | |||
| 3 | Midas is a code name that applies to several devices: |
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| 4 | * Galaxy SIII (GT-I9300) |
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| 5 | * Galaxy Note II (GT-N7100) |
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| 6 | * Galaxy SIII 4G (GT-I9305) |
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| 7 | * Galaxy Note II 4G (GT-N7105) |
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| 8 | 2 | gnutoo | |
| 9 | 13 | gnutoo | h3. Modem firmware and hardware architecture |
| 10 | 2 | gnutoo | |
| 11 | 13 | gnutoo | 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: |
| 12 | 2 | gnutoo | |_. Partition label |_. Mount point |_. Filesystem |_. content | |
| 13 | 12 | gnutoo | | RADIO | /firmware | vfat | modem firmware partition | |
| 14 | 1 | gnutoo | | EFS | /efs | ext4 | modem data partition | |
| 15 | 12 | gnutoo | |
| 16 | 13 | gnutoo | Files inside the RADIO partition on the Galaxy SIII 4G (GT-I9305): |
| 17 | 12 | gnutoo | |
| 18 | |_. File | Format | Usage | |
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| 19 | | acdb.mbn | ? | | |
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| 20 | | apps.mbn | ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, no section header | | |
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| 21 | | dsp1.mbn | ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, no section header | | |
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| 22 | | dsp2.mbn | ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, no section header | | |
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| 23 | | dsp3.mbn | ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, no section header | | |
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| 24 | | efs1.mbn | ? | | |
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| 25 | | efs2.mbn | ? | | |
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| 26 | | efs3.mbn | ? | | |
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| 27 | | mdm_acdb.img | ? | | |
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| 28 | | modem_ds.ima | ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, stripped | | |
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| 29 | | q6.mdt | ELF 32-bit LSB executable, QUALCOMM DSP6, version 1 (SYSV), statically linked, no section header | | |
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| 30 | | rpm.mbn | ? | | |
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| 31 | | sbl1.mbn | ? | | |
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| 32 | | sbl2.mbn | ? | | |
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| 33 | 3 | gnutoo | |
| 34 | 7 | gnutoo | The Replicant project "has some information on the modem boot":https://redmine.replicant.us/projects/replicant/wiki/QMI-RIL#Modem-boot. |
| 35 | 1 | gnutoo | |
| 36 | 7 | gnutoo | Though that page has also information on how to support that modem from Replicant which runs on the Samsung Exynos 4412. |
| 37 | |||
| 38 | 13 | gnutoo | Note that the AP part is also supported by upstream Linux with the "exynos4412-i9305.dts":https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/exynos4412-i9305.dts for the Galaxy SIII 4G and "exynos4412-n710x.dts":https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/exynos4412-n710x.dts for the Galaxy Note II 4G, assuming that you use "u-boot and a nonfree BL1":https://blog.forkwhiletrue.me/posts/an-almost-fully-libre-galaxy-s3/ (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. |
| 39 | 8 | gnutoo | |
| 40 | 13 | gnutoo | h4. Modem Components for the Galaxy SIII 4G |
| 41 | 9 | gnutoo | |
| 42 | 3 | gnutoo | |_. Component type |_. Component model | |
| 43 | 4 | gnutoo | | SOC | [[Qualcomm MDM9615]] | |
| 44 | 1 | gnutoo | |
| 45 | 13 | gnutoo | h3. TODO |
| 46 | 7 | gnutoo | |
| 47 | 13 | gnutoo | * 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). |
| 48 | * Look at the upstream support for the AP modem driver. |
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| 49 | 7 | gnutoo | * Look if the max77693 can route the modem to the USB connector through "resistor values":https://git.replicant.us/replicant/kernel_samsung_smdk4412/tree/drivers/misc/max77693-muic.c#n82. |
