[U-Boot] [RFC PATCH 0/5] move boot0 hook in the beginning for armv7

[Kever Yang]

I think the boot0 hook is suppose to add some data in the very beginning
of the SPL image, am I right?

Rockchip SoCs bootrom design is like this:
- First 2KB or 4KB internal memory is for bootrom stack and heap;
- Then the first 4-byte suppose to be a TAG like 'RK33';
- The the following memory address end with '0004' is the first
  instruction load and running by bootrom;

Example for RK3288:
Before this patch set, the SPL_TEXT_BASE is ff704004, and image write to
media device after mkimage like this:

ff704000: 32334b52 00000000 00000000 00000000    RK32............
ff704010: 00000000 00000000 00000000 00000000    ................
ff704020: ea00000f e59ff014 e59ff014 e59ff014    ................
ff704030: e59ff014 e59ff014 e59ff014 e59ff014    ................

Where the first instruction from bootrom is '00000000', which is a
undefined instruction.
The '_start' and 'reset' have to align to 0x20 for the requirement of
VBAR, the memory offset '004'~'01c' are filled with '00000000'.

We can use the boot0 hook to fix this issue, after this patch set,
the SPL_TEXT_BASE is ff704000 and image write to media device after
mkimage like this:

ff704000: 32334b52 ea00001d e320f000 e320f000    RK32...... ... .
ff704010: e320f000 e320f000 e320f000 e320f000    .. ... ... ... .
ff704020: ea000016 e59ff014 e59ff014 e59ff014    ................
ff704030: e59ff014 e59ff014 e59ff014 e59ff014    ................

The first instruction from bootrom is a 'b reset', and memory of
'008'~'01c' are filled with 'nop' instruction.

This patch set does not provide patch for socfpga, bcm and sunxi SoCs which also
enable BOOT0_HOOK, so this is a RFC patch, please advice how to make it
compatible with those three platforms.



Kever Yang (5):
  armv7: move boot hook before '_start'
  rockchip: boot0: align to 0x20 for armv7 '_start'
  rockchip: enable BOOT0_HOOK for SoCs
  rockchip: configs: use aligned address for SPL_TEXT_BASE
  rockchip: mkimage: use spl_boot0 for all Rockchip SoCs

 arch/arm/include/asm/arch-rockchip/boot0.h |  9 ++++++++-
 arch/arm/lib/vectors.S                     | 19 ++++++++++---------
 arch/arm/mach-rockchip/Kconfig             |  3 +++
 include/configs/rk3036_common.h            |  2 +-
 include/configs/rk3288_common.h            |  2 +-
 tools/rkcommon.c                           |  8 ++++----
 6 files changed, 27 insertions(+), 16 deletions(-)

-- 
1.9.1