diff options
| -rw-r--r-- | CHANGELOG | 2 | ||||
| -rw-r--r-- | README | 8 | ||||
| -rw-r--r-- | common/cmd_bootm.c | 8 |
3 files changed, 18 insertions, 0 deletions
@@ -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. @@ -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", diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c index fa32d46..af62bec 100644 --- a/common/cmd_bootm.c +++ b/common/cmd_bootm.c @@ -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; |