[U-Boot] Going beyond CONFIG_SYS_CBSIZE limit causes a hang

[Fabio Estevam]

Hi,

When I enter the number of characters defined by CONFIG_SYS_CBSIZE
into the console I noticed that further characters are no longer
accepted.

This part is fine. The problem is that after hitting Enter I get a system hang.

To reproduce the problem more easily I set CONFIG_SYS_CBSIZE to only 50:

=> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Unknown command 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' - try 'help
'
(Then the console hangs)

Also tried to enter the maximum of accepted characters
(CONFIG_SYS_CBSIZE is only 50 in this example), then after it reaches
the limit, I hit one backspace followed by Enter:

=> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Unknown command 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' - try 'help'
data abort
pc : [<27706c6e>]          lr : [<27706c65>]
sp : 4f56cdc0  ip : 00000000     fp : 4f56ef70
data abort
pc : [<66a53642>]          lr : [<66653639>]
sp : 4f56ccd8  ip : 0000000f     fp : 4f56ef70
data abort
pc : [<666fffce>]          lr : [<66653635>]
sp : 4f56cbf0  ip : 0000000f     fp : 4f56ef70
data abort
pc : [<666fffea>]          lr : [<66653635>]
sp : 4f56cb08  ip : 0000000f     fp : 4f56ef70
data abort
pc : [<4ff6f1e8>]          lr : [<66653635>]
sp : 4f56ca20  ip : 0000000f     fp : 4f56ef70
data abort
pc : [<666acd74>]          lr : [<66653635>]
sp : 4f56c938  ip : 0000000f     fp : 4f56ef70
data abort
pc : [<4ff6f1e8>]          lr : [<66653635>]
sp : 4f56c850  ip : 0000000f     fp : 4f56ef70
data abort
pc : [<666ffffa>]          lr : [<66653635>]
sp : 4f56c768  ip : 0000000f     fp : 4f56ef70

These tests were made on a mx6qsabresd.

What would be the correct way to to avoid such hangs?

Thanks,

Fabio Estevam