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Samsung Midas 4G » History » Revision 13

Revision 12 (gnutoo, 01/29/2020 05:15 PM) → Revision 13/14 (gnutoo, 02/03/2020 07:41 PM)

h1. Samsung "Midas" 4G: Galaxy SIII 4G (GT-I9305) and Galaxy Note II 4G (GT-N7105) 

 h3. h2. Modem firmware and hardware architecture 

 On both Here are 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): partition: 

 |_. 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":https://redmine.replicant.us/projects/replicant/wiki/QMI-RIL#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":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 if 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. 

 h4. h3. Modem Components for the Galaxy SIII 4G 

 |_. Component type |_. Component model | 
 | SOC | [[Qualcomm MDM9615]] | 

 h3. h2. TODO 

 * Scan both devices the device 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. kernel) 
 * 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. 
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