I don't see how to make this stuff work... I used dtb-rebuilder to produce
the provided DTB with ttyO4:
> # ls -ls /boot/dtbs/`uname -r`/*tty*
> 88 -rw-r--r-- 1 root root 86762 Dec 26 21:37
> /boot/dtbs/3.14.4.1-bone-armhf.com/am335x-boneblack-ttyO1.dtb
> 88 -rw-r--r-- 1 root root 86762 Dec 26 21:37
> /boot/dtbs/3.14.4.1-bone-armhf.com/am335x-boneblack-ttyO2.dtb
> 84 -rw-r--r-- 1 root root 85197 Dec 26 21:37
> /boot/dtbs/3.14.4.1-bone-armhf.com/am335x-boneblack-ttyO4.dtb
> 84 -rw-r--r-- 1 root root 85197 Dec 26 21:37
> /boot/dtbs/3.14.4.1-bone-armhf.com/am335x-boneblack-ttyO5.dtb
> 84 -rw-r--r-- 1 root root 85077 Dec 26 21:37
> /boot/dtbs/3.14.4.1-bone-armhf.com/am335x-bone-ttyO1.dtb
> 84 -rw-r--r-- 1 root root 85077 Dec 26 21:37
> /boot/dtbs/3.14.4.1-bone-armhf.com/am335x-bone-ttyO2.dtb
> 84 -rw-r--r-- 1 root root 85077 Dec 26 21:37
> /boot/dtbs/3.14.4.1-bone-armhf.com/am335x-bone-ttyO4.dtb
> 84 -rw-r--r-- 1 root root 85077 Dec 26 21:37
> /boot/dtbs/3.14.4.1-bone-armhf.com/am335x-bone-ttyO5.dtb
I edited uEnv.txt to set the dtb:
> # cat /boot/uboot/uEnv.txt
> dtb=am335x-boneblack-ttyO4.dtb
> uenvcmd=run findmmc1; run findmmc0; if run loaduimage; then run loadfdt;
> run mmcboot; fi;
> optargs=fixrtc capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN
> findmmc1=if test $board_name = A335BNLT; then setenv mmc1 1; else setenv
> mmc1 0; fi
> findmmc0=setenv mmcdev 0; mmc dev ${mmcdev}; if mmc rescan; then setenv
> mmc0 1; else setenv mmc0 0; fi
> mmcroot=/dev/mmcblk0p2 rw
> loadfdt=ext4load mmc ${mmcdev}:2 ${fdtaddr} /boot/dtbs/${fdtfile}
> loaduimage=if ext4load mmc 0:2 ${loadaddr} /boot/zImage; then setenv
> mmcdev 0; else setenv mmcdev 1; if test $mmc0 = 1; then setenv mmcroot
> /dev/mmcblk1p2 rw; fi; ext4load mmc 1:2 ${loadaddr} /boot/zImage; fi
I don't see any /dev/ttyO4 appearing after a reboot:
> # ls /dev/ttyO*
> /dev/ttyO0 /dev/ttyO1
I don't see how to figure out whether uboot loaded the proper dtb, dunno
where that ends up in any log file. Dunno how to troubleshoot this any
further.
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