[syslinux] PXE Error Reporting

[Andreas Gruenbacher]

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