diff options
| author | Jimi Xenidis <jimix@watson.ibm.com> | 2006-05-18 17:03:05 -0500 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-05-19 15:02:26 +1000 |
| commit | 4d1f3f25d9c303d1ce63b42cc94c54ac0ab2e950 (patch) | |
| tree | ab418b136a78442fc4f0f8d3575da74b82df4bda /arch | |
| parent | 1dc461f0b03fab309eb9214df1c9b586aeaf3b22 (diff) | |
| download | linux-4d1f3f25d9c303d1ce63b42cc94c54ac0ab2e950.tar.gz | |
[PATCH] powerpc: Auto reserve of device tree blob
A devtree compiler (dtc) generated devtree blob is "relocatable" and so
does not contain a reserved_map entry for the blob itself. This means
that if passed to Linux, Linux will not get lmb_reserve() the blob and
it could be over. The following patch will explicitly reserve the
"blob" as it was given to us and stops prom_init.c from creating a
reserved mapping for the blob.
NOTE: that the dtc/kexec should not generate the blob reservation entry.
Although if they do, LMB reserver handles overlaps.
Signed-off-by: <jimix@watson.ibm.com>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 5 | ||||
| -rw-r--r-- | arch/powerpc/kernel/prom_init.c | 9 |
2 files changed, 9 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 8d0415b080bb1f..969f4abcc0be64 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -1267,6 +1267,11 @@ static void __init early_reserve_mem(void) reserve_map = (u64 *)(((unsigned long)initial_boot_params) + initial_boot_params->off_mem_rsvmap); + + /* before we do anything, lets reserve the dt blob */ + lmb_reserve(__pa((unsigned long)initial_boot_params), + initial_boot_params->totalsize); + #ifdef CONFIG_PPC32 /* * Handle the case where we might be booting from an old kexec diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index 2442361772e2fc..98e201c38d27db 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -1950,11 +1950,7 @@ static void __init flatten_device_tree(void) /* Version 16 is not backward compatible */ hdr->last_comp_version = 0x10; - /* Reserve the whole thing and copy the reserve map in, we - * also bump mem_reserve_cnt to cause further reservations to - * fail since it's too late. - */ - reserve_mem(RELOC(dt_header_start), hdr->totalsize); + /* Copy the reserve map in */ memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map)); #ifdef DEBUG_PROM @@ -1967,6 +1963,9 @@ static void __init flatten_device_tree(void) RELOC(mem_reserve_map)[i].size); } #endif + /* Bump mem_reserve_cnt to cause further reservations to fail + * since it's too late. + */ RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE; prom_printf("Device tree strings 0x%x -> 0x%x\n", |