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env_get_default suffers from a particular issue int that it can only return a value truncated to gd->env_buf (32) characters. This may be enough for most variables but it isn't for others, so let's allow users to provide a preallocated buffer to copy the value into instead, allowing for more control, though it'll still be truncated if the value size is bigger than the preallocated buffer. Cc: Quentin Schulz <foss+uboot@0leil.net> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
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