uml: using hostfs as rootfs is not working

[Jan Engelhardt]

Hi,


as per Documentation/uml/*txt, I issued the following to get a direct 
hostfs:

	./linux ubd0=/tftpboot/linux

(/tftpboot/linux/sbin/init exists), but the UM kernel only gives:

Failed to open '/home/tftpboot/linux', errno = 21
ubda: Can't open "/home/tftpboot/linux": errno = 21
List of all partitions:
6200               4 ubda driver: uml-blkdev

So either UML lost some functionality sometime, or the documentation is 
incorrect.
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