[syslinux] PXE Error Reporting

[H. Peter Anvin]

On 01/14/2015 03:49 PM, Sebastian Herbszt wrote:
> Hello Andreas,
> 
> Andreas Gruenbacher wrote:
>> Hello,
>>
>> I've recently ran into a problem trying to boot over TFTP using 
>> pxelinux.0. On the console, I got the following message:
>>
>>    Could not find ramdisk image: initramfs-3.10.0-123.13.2el7.x86_64
>>
>> It took me a while to figure out that the file *could* be found but that 
>> the file  permissions were set wrong and the file couldn't be read. At 
>> the protocol level (tcpdump), the server reply was looking as follows:
>>
>> 0000   00 05 00 00 50 65 72 6d 69 73 73 69 6f 6e 20 64  ....Permission d
>> 0010   65 6e 69 65 64 00                                enied.
>>
>> Likewise, when the kernel image can't be accessed, I get "Could not find 
>> kernel image: vmlinuz-3.10.0-123.13.2.el7.x86_64". So errors are 
>> apparently not reported very well.
>>
>> Could this please be improved?
>>
>> Thanks,
>> Andreas
> 
> which version of pxelinux were you trying? Looks like < 5.x.
> 

The error code is zero, which means there is no way to understand this
error without parsing the string, which is totally server dependent.

	-hpa