Tested on 2016.05 and master @ a26aa9686ad457d208df3b85a39c9befa04caaa3 Followed instructions under board/firefly/firefly-rk3288/readme.txt Then from a TTL I see: arm pll = 600000000HZ periph pll = 300000000HZ ddr pll = 200000000HZ codec pll = 594000000HZ Board: Rockchip platform Board DRAM: Found dram banks:1 Adding bank:0000000000000000(0000000080000000) 128 MiB SDCard Update. storage init OK! Using default environment GetParam W: Invalid Parameter's tag (0x7BD32A6C)! Invalid parameter W: Invalid Parameter's tag (0xF07F8F7D)! Invalid parameter W: Invalid Parameter's tag (0xAE8ED94E)! Invalid parameter W: Invalid Parameter's tag (0x5EFFD968)! Invalid parameter W: Invalid Parameter's tag (0xEDDF0B28)! Invalid parameter W: Invalid Parameter's tag (0xE89DA830)! Invalid parameter W: Invalid Parameter's tag (0x00000802)! Invalid parameter W: Invalid Parameter's tag (0x00000000)! Invalid parameter failed to find part:boot failed to prepare fdt from boot! failed to find part:resource failed to prepare fdt from resource! no adc node can't find dts node for led can't find dts node for ricoh619 can't find dts node for act8846 can't find dts node for rk808 can't find dts node for rk818 Can't find dts node for fuel guage cw201x SecureBootEn = 0, SecureBootLock = 0 #Boot ver: 0000-00-00#0.00 empty serial no. unknown reboot type 1 no fuel gauge found no fuel gauge found read logo_on switch from dts [0] no fuel gauge found failed to find part:recovery 'recovery' does not seem to be a partition nor an address Unable to boot:recovery try to start backup failed to find part:backup 'backup' does not seem to be a partition nor an address Unable to boot:backup try to start rockusb but get no shell.
Unfortunately, the original submitter of the defconfig for this platform no longer have access to the hardware, so we are not able to investigate this issue. Your only chance is to investigate the problem yourself, and contribute a patch to Buildroot to fix it.
I have managed to boot from TTL as follows: - enter recovery mode (hold recovery and restart board by resetting) - download upgrade tool, and official Ubuntu image, and run: sudo ./Linux_Upgrade_Tool_v1.2/upgrade_tool uf Firefly-RK3288_Ubuntu14.04_201607222032.img This burns the image to the eMMC. - that image works. From inside of it, clear eMMC to ensure that it will not be used instead of the SD: sudo dd if=/dev/zero of=/dev/mmblk0 - try again However I can't get HDMI / VGA output to my screen, only TTL access. I also tried to insert the cable after boot, but it did not help.