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PATCH: Select root device

DISCUSSION Richard Wallman 1 participant 1 message Jul 21, 2006

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Richard Wallman

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Okay, for those with the luxury of having two floppy drives or a hard disk, here's a patch that will let you select the root device during kernel configuration.

Here's the output of 'cvs diff': (mind email client wrap)

Index: Documentation/Configure.help
===================================================================
RCS file: /cvsroot/elks/elks/Documentation/Configure.help,v retrieving revision 1.40
diff -r1.40 Configure.help
588a589,610

Quoted 14 lines

# Root device select
# ~~~~~~~~~~~~~~~~~~

Selecting the root filesystem device
CONFIG_ROOTDEV_FD0
Once the kernel has loaded, it will look for the root filesystem to boot the rest of the system (drivers, shells, etc.)
You have the following options:

/dev/fd0
The first floppy drive. If the kernel has been loaded from that drive, the drive is empty, or the disk in the drive doesn't contain a MINIX filesystem, the kernel will wait and prompt you to insert a root disk.

Quoted 8 lines

/dev/fd1
Once the kernel has loaded, it will look for the root filesystem on the second floppy drive.

/dev/bda1
Once the kernel has loaded, it will look for the root filesystem on the first primary partition of the first hard disk.

Index: arch/i86/boot/bootsect.S
===================================================================
RCS file: /cvsroot/elks/elks/arch/i86/boot/bootsect.S,v retrieving revision 1.4
diff -r1.4 bootsect.S
45c45
< ROOT_DEV = 0
---

Quoted 1 line

! ROOT_DEV = 0

529c529
< .word ROOT_DEV
---

Quoted 1 line

.word ROOTDEV

Index: arch/i86/drivers/block/Config.in
===================================================================
RCS file: /cvsroot/elks/elks/arch/i86/drivers/block/Config.in,v retrieving revision 1.10
diff -r1.10 Config.in
54a55,60

Quoted 6 lines
      comment 'Root location'
      choice 'is the root device' \
              "/dev/fd0       CONFIG_ROOTDEV_FD0      \
               /dev/fd1        CONFIG_ROOTDEV_FD1     \
               /dev/bda1       CONFIG_ROOTDEV_BDA1" /dev/fd0

Index: arch/i86/tools/build.c
===================================================================
RCS file: /cvsroot/elks/elks/arch/i86/tools/build.c,v retrieving revision 1.9
diff -r1.9 build.c
147a148,151

Quoted 4 lines
#if ROOTDEV
        major_root = ROOTDEV >> 8;
        minor_root = ROOTDEV & 0xff;

#else

149a154

Quoted 1 line

#endif

151c156
< fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
---

Quoted 1 line

fprintf(stderr, "Root device is (%d, %hhu)\n", major_root,

minor_root);
Index: include/linuxmt/config.h
===================================================================
RCS file: /cvsroot/elks/elks/include/linuxmt/config.h,v retrieving revision 1.14
diff -r1.14 config.h
9a10,29

Quoted 12 lines

#ifdef CONFIG_ROOTDEV_FD0
#define ROOTDEV 0x0380
#endif

#ifdef CONFIG_ROOTDEV_FD1
#define ROOTDEV 0x03c0
#endif

#ifdef CONFIG_ROOTDEV_RAM
#define ROOTDEV 0x0100
#endif

Quoted 8 lines

#ifdef CONFIG_ROOTDEV_BDA1
#define ROOTDEV 0x0301
#endif

#ifndef ROOTDEV
#define ROOTDEV 0x0380
#endif

17a38

Quoted 1 line

#ifndef CONFIG_ROOTDEV

Signature · 1 line
Richard Wallman