SciphoneDreamG2 » History » Version 12
steve-m, 02/19/2016 10:49 PM
1 | 1 | laforge | = Sciphone Dream G2 = |
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3 | The Sciphone Dream G2 is a [wiki:MT6235] based phone running UI software to mimic the look+feel of Android. |
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4 | |||
5 | There is currently an u-boot and Linux port for the MT6235 underway, the primary development platform is the Sciphone G2. |
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6 | |||
7 | OsmocomBB does not yet support any Mediatek chipsets, so this phone is not supported by OsmocomBB. Nonetheless, we |
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8 | expect to have support for it at some point in the future. |
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9 | |||
10 | 3 | laforge | More information on the hardware of the device can be found at [http://en.qi-hardware.com/wiki/Sciphone_Dream_G2] |
11 | 2 | steve-m | == Serial Cable == |
12 | |||
13 | You can make a serial cable by sacrificing the headset that comes with the phone, by swapping the pins inside the connector. |
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14 | |||
15 | Serial pinout: |
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16 | |||
17 | 9 | laforge | ||Pin||signal||comment|| |
18 | 2 | steve-m | ||1||GND|| |
19 | ||2||GND|| |
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20 | 9 | laforge | ||5||Rx||(From PC to Phone)|| |
21 | ||7||Tx||(From Phone to PC)|| |
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22 | 2 | steve-m | |
23 | [[Image(sciphone_serial.jpg,20%)]] |
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24 | |||
25 | 1 | laforge | == JTAG == |
26 | |||
27 | The JTAG port of the MT6235 is accessible on the phone PCB, see the attached picture. |
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28 | 5 | steve-m | You can use [http://openocd.berlios.de/web/ OpenOCD] along with the attached configuration file ([raw-attachment:openocd_mt6235.cfg]) for debugging. |
29 | 4 | steve-m | |
30 | 6 | laforge | [[Image(scig2_front.JPG,20%)]] |
31 | [[Image(scig2_jtag.jpg,20%)]] |
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32 | |||
33 | 4 | steve-m | == Serial Bootloader == |
34 | |||
35 | 5 | steve-m | Like all Mediatek MT62xx !SoCs, the phone uses the [wiki:MTKRomloader]. |
36 | 6 | laforge | |
37 | 10 | steve-m | For executing U-Boot and Linux using the MTK romloader, proceed as follows: |
38 | |||
39 | 11 | steve-m | * clone osmocom-bb.git and checkout the branch 'steve-m/loader_sciphone' |
40 | 10 | steve-m | * compile the code, connect the phone and run osmocon: |
41 | {{{ |
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42 | 12 | steve-m | $ ./osmocon -p /dev/ttyUSB0 -m mtk ../../target/firmware/board/mt62xx/loader.mtkram.bin |
43 | 10 | steve-m | }}} |
44 | * press and '''hold''' the powerbutton of the phone, until the loading has finished and you see the following: |
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45 | {{{ |
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46 | [...] |
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47 | Received branch address ack, code should run now |
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48 | |||
49 | Running on mt62xx in environment mtkram |
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50 | HW_CODE = 0x6235 |
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51 | }}} |
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52 | |||
53 | '''Uploading U-Boot''' |
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54 | * '''don't''' terminate osmocon and execute: |
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55 | {{{ |
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56 | $ ./osmoload memload 0x500000 u-boot.bin |
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57 | $ ./osmoload jump 0x500000 |
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58 | }}} |
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59 | |||
60 | * now terminate osmocon and open a serial terminal of your choice (115200-8N1) |
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61 | * see below for loading Linux with U-Boot |
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62 | |||
63 | 6 | laforge | == U-Boot == |
64 | |||
65 | Port of U-Boot for Sciphone G2 can be found at [http://git.osmocom.org/gitweb?p=uboot-mt623x.git;a=summary U-Boot] |
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66 | |||
67 | Building U-Boot: |
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68 | |||
69 | {{{ |
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70 | export CROSS_COMPILE=arm-linux-gnueabi- |
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71 | make sciphone_g2_config |
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72 | make |
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73 | }}} |
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74 | |||
75 | == Linux kernel == |
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76 | |||
77 | Port of Linux kernel for Sciphone G2 can be found at [http://git.osmocom.org/gitweb?p=linux-mt623x.git;a=summary Linux kernel] |
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78 | |||
79 | Building Linux: |
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80 | |||
81 | {{{ |
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82 | export CROSS_COMPILE=arm-linux-gnueabi- |
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83 | 7 | laforge | make ARCH=arm sciphone_g2_defconfig |
84 | 6 | laforge | make ARCH=arm uImage |
85 | }}} |
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86 | |||
87 | 8 | laforge | == Building initramfs file system == |
88 | |||
89 | The easiest way to have file system in Linux kernel is to build [http://www.kernel.org/doc/Documentation/filesystems/ramfs-rootfs-initramfs.txt Initramfs image].[[BR]] |
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90 | |||
91 | You need to download [http://www.busybox.net/ Busybox], configure it and build it. |
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92 | |||
93 | {{{ |
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94 | export CROSS_COMPILE=arm-linux-gnueabi- |
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95 | make menuconfig |
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96 | make |
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97 | }}} |
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98 | |||
99 | Additional to that you'll need to create console device in already built filesystem. |
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100 | |||
101 | {{{ |
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102 | sudo mknod dev/console c 5 1 |
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103 | }}} |
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104 | |||
105 | Now you can create CPIO archive: |
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106 | |||
107 | {{{ |
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108 | find . | cpio -o -H newc > rootfs.cpio |
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109 | }}} |
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110 | |||
111 | Next step is to point to Linux kernel where initramfs image is located.[[BR]] |
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112 | |||
113 | In menuconfig of Linux kernel you should modify following option: |
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114 | |||
115 | {{{ |
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116 | CONFIG_INITRAMFS_SOURCE=<path_to_cpio> |
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117 | General setup -> Initial RAM filesystem and RAM disk -> Initramfs source file(s) |
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118 | }}} |
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119 | |||
120 | After these steps Linux kernel image will have initramfs built in.[[BR]] |
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121 | |||
122 | '''Important note:''' Initramfs ignores 'init=' variable given in kernel boot parameters list. It always executes /init command at startup and you can't change it. Check if you have /init in your file system (BusyBox has /linuxrc by default, so just change its name to init). |
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123 | Every time you change initramfs file system you have to rebuild also Linux kernel.[[BR]] |
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124 | |||
125 | To unpack CPIO archive you can use following command: |
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126 | |||
127 | {{{ |
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128 | cpio -i -d -H newc -F <path_to_cpio_archive> --no-absolute-filenames |
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129 | }}} |
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130 | |||
131 | 6 | laforge | == Reading data files in U-Boot == |
132 | |||
133 | '''NAND''' |
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134 | |||
135 | 7 | laforge | Following command will read 256 bytes from NAND address 0 at address 0x800000. |
136 | 6 | laforge | |
137 | {{{ |
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138 | 7 | laforge | nand read 0x800000 0 0x100 |
139 | 6 | laforge | }}} |
140 | |||
141 | '''Serial''' |
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142 | |||
143 | 7 | laforge | Following command will read data at address 0x800000 from serial at baudrate 115200 (using kermit protocol). |
144 | 6 | laforge | |
145 | {{{ |
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146 | 7 | laforge | loadb 0x800000 115200 |
147 | 6 | laforge | }}} |
148 | |||
149 | '''SD/MMC''' |
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150 | |||
151 | 7 | laforge | Following command will read uImage file at address 0x800000 from MMC card. |
152 | 6 | laforge | |
153 | {{{ |
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154 | 7 | laforge | fatload mmc 0 0x800000 uImage |
155 | 6 | laforge | }}} |