diff options
| author | Tom Rini <trini@konsulko.com> | 2022-10-31 14:43:04 -0400 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2022-10-31 14:43:04 -0400 |
| commit | a90afc6730e6c67ad37f4c98a02891a93b4ff971 (patch) | |
| tree | 724c085433631e142a56c052d667139cba29b4a6 /doc/README.arm-relocation | |
| parent | 6f38d91158e7e4199753b79e0a25c1a65175aba4 (diff) | |
| parent | 77bec9e3d8bd2dc307447b92a3d5cefd693a62ad (diff) | |
Merge branch '2022-10-31-vbe-implement-the-full-firmware-flow'
To quote Simon:
This series provides an implementation of VBE from TPL through to U-Boot
proper, using VBE to load the relevant firmware stages. It buils a single
image.bin file containing all the phases:
TPL - initial phase, loads VPL using binman symbols
VPL - main firmware phase, loads SPL using VBE parameters
SPL - loads U-Boot proper using VBE parameters
U-Boot - final firmware phase, where OS booting is processed
This series does not include the OS-booting phase. That will be the
subject of a future series.
The implementation is entirely handled by sandbox. It should be possible
to enable this on a real board without much effort, but that is also the
subject of a future series.
Diffstat (limited to 'doc/README.arm-relocation')
| -rw-r--r-- | doc/README.arm-relocation | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/doc/README.arm-relocation b/doc/README.arm-relocation index bc6644911b9..6bb4e178474 100644 --- a/doc/README.arm-relocation +++ b/doc/README.arm-relocation @@ -41,7 +41,7 @@ Boards which are not fixed to support relocation will be REMOVED! ----------------------------------------------------------------------------- For boards which boot from spl, it is possible to save one copy -if CONFIG_SYS_TEXT_BASE == relocation address! This prevents that uboot code +if CONFIG_TEXT_BASE == relocation address! This prevents that uboot code is copied again in relocate_code(). example for the tx25 board booting from NAND Flash: @@ -58,7 +58,7 @@ e) there it copy u-boot to CONFIG_SYS_NAND_U_BOOT_DST and f) u-boot code steps through board_init_f() and calculates the relocation address and copy itself to it -If CONFIG_SYS_TEXT_BASE == relocation address, the copying of u-boot +If CONFIG_TEXT_BASE == relocation address, the copying of u-boot in f) could be saved. ----------------------------------------------------------------------------- @@ -68,10 +68,10 @@ TODO - fill in struct bd_info infos (check) - adapt all boards -- maybe adapt CONFIG_SYS_TEXT_BASE (this must be checked from board maintainers) +- maybe adapt CONFIG_TEXT_BASE (this must be checked from board maintainers) This *must* be done for boards, which boot from NOR flash - on other boards if CONFIG_SYS_TEXT_BASE = relocation baseaddr, this saves + on other boards if CONFIG_TEXT_BASE = relocation baseaddr, this saves one copying from u-boot code. - new function dram_init_banksize() is actual board specific. Maybe @@ -91,7 +91,7 @@ Relocation with SPL (example for the tx25 booting from NAND Flash): - This u-boot does no RAM init, nor CPU register setup. Just look where it has to copy and relocate itself to this address. If - relocate address = CONFIG_SYS_TEXT_BASE (not the same, as the + relocate address = CONFIG_TEXT_BASE (not the same, as the CONFIG_SPL_TEXT_BASE from the spl code), then there is no need to copy, just go on with bss clear and jump to board_init_r. |