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Description of problem:
When doing a PXE install, any kernel parameters that are passed to the
installing client locally (i.e. on the local console, not passed via TFTP or
DHCP) are truncated to the first 28 characters.


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.Setup a PXE installation environment
2.Boot a client and hit F8 to bring up the PXE boot menu
3.Select install
4.Press a key to enter kernel parameters
5.Enter a long list of kernel parameters that will be ignored (e.g. -s
a123456789 b123456789 c123456789
6.Let the installation complete
7.After the post-installation reboot, type 'cat /proc/cmdline' to see the kernel
parameters that the kernel was started with
	

Actual Results:  The contents of /proc/cmdline is truncated to the first 28
characters

Expected Results:  The contents of /proc/cmdline should contain up to 255 chars

Additional info:

Possibly found the problem in pxe-linux/nbp.linux/prepare.c

line 18:
typedef struct s_bootsect_table {
        unsigned char reserved1[32];
        unsigned cmdline_magic;
        unsigned cmdline_offset;
        unsigned char reserved2[461];
...

line 214:
        strcpy(bootsect.reserved2, cmdline);    // copy the kernel
                                                // params to bootsect
line 258:
        memset(&((UINT8 *)&bootsect)[0x40], 0, 0x12); // fill bootsect
                                                      // starting at
                                                      // offset 64

Line 258 appears to be the culprit - reserved2 starts at offset 36 and we blank
it from 64 onwards, leaving only the first 28 characters of the kernel parameters.