Short version:
* this patch fixes exception handling on i.MX27 which was broken, probably from day one.
* i.MX27-based board Maintainers please test this patch: make sure your board boots with it and make sure e.g. a write to address 0 causes U-Boot to signal a data abort.
* i.MX custodian please review this patch and let me know if this should also be done for other i.MX SoCs as well.
Long version:
This patch was created after apf27 maintainer found out that the board did not boot any more. The root cause was that commit 3ff46cc4 would try and write into the exception vectors table, which i.MX27 has in ROM. This caused a data abort, and as the U-Boot vectors were not in place yet, this abort went to the ROM code which silently hung.
Investigation led to a patch sent in 2009 to the list (but never applied) with a description of the i.MX27 exception handling:
http://lists.denx.de/pipermail/u-boot/2009-October/062811.html
By his own author's admission, this patch was not fit for inclusion in U-Boot, but it gave the technical information needed to produce this present patch set.
The first patch is only cosmetic, fixing whitespace quirks which affect legibility or cause a warning in patman.
The second patch moves vectors relocation out of the relocate_code routine and into its own relocate_vectors routine. This routine is made weak so that it can be replaced by a SoC-specific, strong one. Such a strong replacement is provided for i.MX27.
Changes in v2: - Fixed wrong i.MX27 vector relocation code
Albert ARIBAUD (2): cosmetic: arm: fix whitespace in arch/arm/lib/relocate.S imx: fix exception vectors relocation in imx27
arch/arm/cpu/arm926ejs/mx27/Makefile | 4 ++ arch/arm/cpu/arm926ejs/mx27/relocate.S | 51 ++++++++++++++++++++++++ arch/arm/lib/crt0.S | 5 +++ arch/arm/lib/relocate.S | 73 ++++++++++++++++++++-------------- 4 files changed, 103 insertions(+), 30 deletions(-) create mode 100644 arch/arm/cpu/arm926ejs/mx27/relocate.S