Group: Hardware/Computers/Single Board Computers/TBS2910 Matrix ARM mini PC
(→Boot settings) |
(→Boot settings) |
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The value of BT_FUSE_SEL3 is available SRC_SBMR2[4] so here it's 0, which doesn't make sense as the board is booting. | The value of BT_FUSE_SEL3 is available SRC_SBMR2[4] so here it's 0, which doesn't make sense as the board is booting. | ||
− | From the Reference manual | + | From the Reference manual: |
<pre> | <pre> | ||
If set to Boot From Fuses, the boot flow is controlled by the BT_FUSE_SEL eFUSE | If set to Boot From Fuses, the boot flow is controlled by the BT_FUSE_SEL eFUSE | ||
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attempts to boot from the selected boot device. | attempts to boot from the selected boot device. | ||
</pre> | </pre> | ||
+ | |||
+ | TODO: Check u-boot md convensions |
Revision as of 19:08, 11 January 2020
Introduction
The TBS2910 Matrix ARM mini PC is an I.MX6 Quad SBC.
Upstream support
u-boot: tbs2910_defconfig
Linux: imx6q-tbs2910.dts
Boot settings
The board I have has the following markings on the PCB: TBS-2910V23
The schematics don't seem to fully match as I've a switch component with 4 switches inside whereas the schematics have 8.
Hence my need to document the boot settings.
SRC_SBMR2 is at 0x020D801C according to the IMX6DQRM.pdf reference manual.
Matrix U-Boot> md.w 0x020D801C 2 020d801c: 0001 0200 ....
BMOD[1:0] are the bits 24 and 25 of that register, which are zero here.
BMOD is a register field that correspond to the BOOT_MODE settings, which are explained in the table below or the table in the "8.2.1 Boot mode pin settings" chapter of the reference manual.
BOOT_MODE[1:0] | Boot Type |
---|---|
00 | Boot From Fuses |
01 | Serial Downloader |
10 | Internal Boot |
11 | Reserved |
So we are in "Boot From Fuses" mode.
Matrix U-Boot> md.w 0x020D801C 2 020d801c: 0001 0200 ....
The value of BT_FUSE_SEL3 is available SRC_SBMR2[4] so here it's 0, which doesn't make sense as the board is booting.
From the Reference manual:
If set to Boot From Fuses, the boot flow is controlled by the BT_FUSE_SEL eFUSE value. If BT_FUSE_SEL = 0, indicating that the boot device (for example, Flash, SD/ MMC) has not yet been programmed, the boot flow jumps directly to the Serial Downloader. If BT_FUSE_SEL = 1, the normal boot flow is followed, where the ROM attempts to boot from the selected boot device.
TODO: Check u-boot md convensions