AT91SAM9260EK kernel atualizado de 2.6 para 4.4, porta serial não funciona

Question

É verdade que este é o grande salto do kernel. 2.6 não tinha nenhum conceito de árvore de dispositivos e ainda não criei a árvore de dispositivos para o meu produto. Então, apenas arquivos de árvore de dispositivo padrão com a forma antiga de configurações UART em arquivos de placa. Kernel surge sem UART, eu acho, porque o nada acontece depois de "Iniciando Kernel ...".

Qualquer entrada é muito apreciada. Obrigado

U-Boot> setenv linux1 'tftpboot 20cfffc0 kernel.latest'
U-Boot>
U-Boot> setenv linux2 'tftpboot 206fffc0 initrd.latest'
U-Boot>
U-Boot> setenv linux3 'bootm 20cfffc0'
U-Boot>
U-Boot> setenv bootlinux 'run linux1 linux2 linux3'
U-Boot>
U-Boot> setenv ipaddr
U-Boot>
U-Boot> setenv serverip
U-Boot>
U-Boot> setenv resetuser
U-Boot>
U-Boot> run bootlinux
BCM5241A PHY Detected
waited 1680 msec
End of Autonegotiation
TFTP from server ; our IP address is 
Filename 'kernel.latest'.
Load address: 0x20cfffc0
Loading: #################################################################
         ########################################################
done
Bytes transferred = 1764880 (1aee10 hex)
TFTP from server ; our IP address is ---
Filename 'initrd.latest'.
Load address: 0x206fffc0
Loading: #################################################################
         #################################################################
         ##################################
done
Bytes transferred = 2405916 (24b61c hex)
## Booting kernel from Legacy Image at 20cfffc0 ...
   Image Name:   WLNN_9G20_4.99
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1764816 Bytes =  1.7 MB
   Load Address: 20d00000
   Entry Point:  20d00000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...