RE: [ts-7000] Re: Jesse's new bootloader...

["William C. Landolina" <>]

> Hi Bill,
>
> ...
> Then, in /etc/rc, I put a little program that looks at the kernel and
if
> it is the stripped down boot kernel, loads a new, full featured kernel
> from the compact flash.
>
> This is a great idea.  Would you share how you check for the
> stripped-down kernel?
>
> I've built a stripped-down kernel that fits in flash and boots from
> wd0, but I'm not sure how to do the check in /etc/rc.
>
> Thanks,
> Joe

The code I use to figure out which kernel I have and (optionally) boot a
more full featured kernel is below.

All my bootstrap kernels are named something-BOOT.  This little program
is called very early in my /etc/rc.

Another possibility is to attempt to open a device that is not in the
bootstrap kernel and check the error code for "Device not configured".

This program is a quickie I whipped up to get product out the door.
There is plenty of room here for more intelligence and subtlety.

Enjoy,
Bill

------ bootstrap.cxx --------

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

#include <sys/param.h>
#include <sys/sysctl.h>

#define DEFAULT_KERNEL "/kernel/netbsd-wd0.bin"
#define DEFAULT_BASE (0x200000)

char kernelName[1000] = DEFAULT_KERNEL;
long baseAddress = DEFAULT_BASE;

void usage()
{
        fprintf(stderr, "Usage: bootstrap {-dr} {-k kernel-name} {-b
base-address}\n");
        fprintf(stderr, "  -d Enable diagnostic output\n");
        fprintf(stderr, "  -r Boot new kernel if 'BOOT' kernel is
detected\n");
        fprintf(stderr, "  -k Specfiy kernel to boot (if -r), default:
%s\n", DEFAULT_KERNEL);
        fprintf(stderr, "  -b Specifiy alternate base address, default:
0x%X\n", DEFAULT_BASE);
        exit(1);
}

int main(int argc, char *argv[])
{
        int rc;
        int ch;
        char sysname[2000];
        size_t namlen = sizeof(sysname);

        bool debug = false;
        bool reboot = false;
        while ((ch = getopt(argc, argv, "drk:b:")) != -1) {
                switch (ch) {
                        case 'd': debug = true;         break;
                        case 'r': reboot = true;        break;
                        case 'k': strncpy(kernelName, optarg,
sizeof(kernelName)); break;
                        case 'b': baseAddress = strtoul(optarg, 0, 0);
break;
                        default: usage(); break;
                }
        }
        argc -= optind;
        argv += optind;

        rc = sysctlbyname("kern.version", sysname, &namlen, NULL,
(size_t) 0);
        if (rc != 0) {
                strerror(errno);
                return (1);
        } else {
                if (namlen >= sizeof(sysname))
                        namlen = sizeof(sysname) - 1;
                sysname[namlen] = '\0';
        }

        if (debug) {
                printf("Kernel name: %s\n", kernelName);
                printf("Base Address: 0x%X\n", baseAddress);
                printf("kern.version: %s", sysname);
        }

        if (strstr(sysname, "BOOT")) {
                char syscmd[2000];
                if (debug)
                        printf("Bootstrap kernel detected.\n");
                if (reboot) {
                        printf("Booting operating kernel: %s\n",
kernelName);
                        snprintf(syscmd, sizeof(syscmd),
"/usr/local/bin/bsdbootloader -b 0x%x %s",
                                baseAddress, kernelName);
                        system(syscmd);
                }
        } else {
                if (debug)
                        printf("Operating kernel detected.\n");
        }

        return (0);
}





 
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