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Add zero-copy ramdisk support (requires corresponding kernel support!)

This commit is contained in:
wdenk 2003-05-23 23:18:21 +00:00
parent 4c3b21a5f9
commit 38b99261c1
3 changed files with 18 additions and 0 deletions
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2
CHANGELOG
View File

@ -2,6 +2,8 @@
Changes since U-Boot 0.3.1:
======================================================================
* Add zero-copy ramdisk support (requires corresponding kernel support!)
* Patch by Kyle Harris, 20 May 2003:
In preparation for an ixp port, rename cpu/xscale and arch-xscale
into cpu/pxa and arch-pxa.

8
README
View File

@ -1988,6 +1988,14 @@ Some configuration options can be set using Environment Variables:
setenv initrd_high 00c00000
If you set initrd_high to 0xFFFFFFFF, this is an
indication to U-Boot that all addresses are legal
for the Linux kernel, including addresses in flash
memory. In this case U-Boot will NOT COPY the
ramdisk at all. This may be useful to reduce the
boot time on your system, but requires that this
feature is supported by your Linux kernel.
ipaddr - IP address; needed for tftpboot command
loadaddr - Default load address for commands like "bootp",

8
common/cmd_bootm.c
View File

@ -374,6 +374,7 @@ do_bootm_linux (cmd_tbl_t *cmdtp, int flag,
ulong cmd_start, cmd_end;
ulong initrd_high;
ulong data;
int initrd_copy_to_ram = 1;
char *cmdline;
char *s;
bd_t *kbd;
@ -385,6 +386,8 @@ do_bootm_linux (cmd_tbl_t *cmdtp, int flag,
* turning the "load high" feature off. This is intentional.
*/
initrd_high = simple_strtoul(s, NULL, 16);
if (initrd_high == ~0)
initrd_copy_to_ram = 0;
} else { /* not set, no restrictions to load high */
initrd_high = ~0;
}
@ -567,6 +570,10 @@ do_bootm_linux (cmd_tbl_t *cmdtp, int flag,
}
if (data) {
if (!initrd_copy_to_ram) { /* zero-copy ramdisk support */
initrd_start = data;
initrd_end = initrd_start + len;
} else {
initrd_start = (ulong)kbd - len;
initrd_start &= ~(4096 - 1); /* align on page */
@ -621,6 +628,7 @@ do_bootm_linux (cmd_tbl_t *cmdtp, int flag,
memmove ((void *)initrd_start, (void *)data, len);
#endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
printf ("OK\n");
}
} else {
initrd_start = 0;
initrd_end = 0;