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I can’t boot the Alpine linux kernel on my armhf boards (tested on Cubieboard and OrangePI Plus with similar results).

Sample u-boot session below, messages stop after “Starting kernel” and board requires a hard reset:

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=>setenv bootargs earlyprintk console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootwait
=>env set fdt_high ffffffff
=>fatload mmc 0 0x46000000 vmlinuz-vanilla
3834368 bytes read in 310 ms (11.8 MiB/s)
=>fatload mmc 0 0x49000000 linux-4.19.13-0-vanilla-sun4i-a10-cubieboard.dtb
22448 bytes read in 4 ms (5.4 MiB/s)
=>bootz 0x46000000 - 0x49000000

## Flattened Device Tree blob at 49000000
Booting using the fdt blob at 0x49000000
Using Device Tree in place at 49000000, end 490087af

Starting kernel …

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Building from the same kernel version with a default configuration (multi_v7_defconfig) generates a working kernel.

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make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- multi_v7_defconfig

make j 5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf LOADADDR=0x40008000 zImage dtbs

make j 5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf modules

make j 5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf INSTALL_MOD_PATH=output modules_install

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(from redmine: issue id 9826, created on 2019-01-03)