The documented way of disabling relocation of the initrd or FDT is setting initrd_high or fdt_high to 0xffffffff. However, that is actually wrong on 64-bit platforms, where 0xffffffffffffffff needs to be used. This is somewhat painful:
- Some platforms (e.g. Raspberry Pi) have a common file setting fdt_high or initrd_high to 0xffffffff that is included in both 32-bit builds (RPi 1, 2) and 64-bit builds (RPi 3). Those are currently not doing the right thing in 64-bit builds, and it wouldn't be nice to #ifdef around that. - Typing the 16 consecutive f's in 0xffffffffffffffff is not very pleasant.
To fix these, make the initrd_high and fdt_high handling accept a special value "no_reloc" that does the right thing independent of the bitness. The old values keep working for compatibility.
Signed-off-by: Tuomas Tynkkynen tuomas@tuxera.com --- Only compile-tested so far.
README | 18 +++++++++++------- common/image-fdt.c | 2 +- common/image.c | 2 +- 3 files changed, 13 insertions(+), 9 deletions(-)
diff --git a/README b/README index 7e0dd35f93..e5e10e46ca 100644 --- a/README +++ b/README @@ -4940,12 +4940,14 @@ List of environment variables (most likely not complete): of the 704 MB low memory, so that Linux kernel can access it during the boot procedure.
- If this is set to the special value 0xFFFFFFFF then - the fdt will not be copied at all on boot. For this - to work it must reside in writable memory, have - sufficient padding on the end of it for u-boot to - add the information it needs into it, and the memory - must be accessible by the kernel. + If this is set to "no_reloc" or to the largest + possible address (0xFFFFFFFF on 32-bit platforms, + 0xFFFFFFFFFFFFFFFF on 64-bit platforms), the fdt + will not be copied at all on boot. For this to work + it must reside in writable memory, have sufficient + padding on the end of it for u-boot to add the + information it needs into it, and the memory must + be accessible by the kernel.
fdtcontroladdr- if set this is the address of the control flattened device tree used by U-Boot when CONFIG_OF_CONTROL is @@ -4978,7 +4980,9 @@ List of environment variables (most likely not complete):
setenv initrd_high 00c00000
- If you set initrd_high to 0xFFFFFFFF, this is an + If you set initrd_high to "no_reloc" or to the largest + possible address (0xFFFFFFFF on 32-bit platforms, + 0xFFFFFFFFFFFFFFFF on 64-bit platforms), 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 diff --git a/common/image-fdt.c b/common/image-fdt.c index e7540be8d6..3e3113b51c 100644 --- a/common/image-fdt.c +++ b/common/image-fdt.c @@ -136,7 +136,7 @@ int boot_relocate_fdt(struct lmb *lmb, char **of_flat_tree, ulong *of_size) if (fdt_high) { void *desired_addr = (void *)simple_strtoul(fdt_high, NULL, 16);
- if (((ulong) desired_addr) == ~0UL) { + if (((ulong) desired_addr) == ~0UL || !strcmp(fdt_high, "no_reloc")) { /* All ones means use fdt in place */ of_start = fdt_blob; lmb_reserve(lmb, (ulong)of_start, of_len); diff --git a/common/image.c b/common/image.c index 8c35327745..35c67856c5 100644 --- a/common/image.c +++ b/common/image.c @@ -1229,7 +1229,7 @@ int boot_ramdisk_high(struct lmb *lmb, ulong rd_data, ulong rd_len, * turning the "load high" feature off. This is intentional. */ initrd_high = simple_strtoul(s, NULL, 16); - if (initrd_high == ~0) + if (initrd_high == ~0 || !strcmp(s, "no_reloc")) initrd_copy_to_ram = 0; } else { initrd_high = getenv_bootm_mapsize() + getenv_bootm_low();