Chromebook bob and kevin typically run coreboot as the initial boot loader, however, U-Boot proper can be used as a secondary boot loader. It is also possible to run U-Boot SPL and proper bare metal, with SPL and the U-Boot payload loaded from SPI flash.
Because of this chromebook bob and kevin only use SPL and not TPL+SPL like other RK3399 boards, this mean that SPL is loaded to and run from SRAM instead of DRAM.
The U-Boot payload is located at 0x40000 (256 KiB) offset in SPI flash and because the BROM only read first 2 KiB for each 4 KiB page, the size of SPL (idbloader.img) is limited to max 128 KiB.
The chosen bss start address further limits the size of SPL to 120 KiB.
0xff8e0000 (SPL_BSS_START_ADDR) - 0xff8c2000 (SPL_TEXT_BASE) = 0x1e000
Update SPL_MAX_SIZE to reflect the 120 KiB max size limitation.
Signed-off-by: Jonas Karlman jonas@kwiboo.se Reviewed-by: Kever Yang kever.yang@rock-chips.com --- v2: Update commit message v2: Collet r-b tag --- configs/chromebook_bob_defconfig | 2 +- configs/chromebook_kevin_defconfig | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/configs/chromebook_bob_defconfig b/configs/chromebook_bob_defconfig index 55d44700d6ec..805da11dbf6a 100644 --- a/configs/chromebook_bob_defconfig +++ b/configs/chromebook_bob_defconfig @@ -35,7 +35,7 @@ CONFIG_BOARD_EARLY_INIT_R=y CONFIG_BLOBLIST=y CONFIG_BLOBLIST_ADDR=0x100000 CONFIG_BLOBLIST_SIZE=0x1000 -CONFIG_SPL_MAX_SIZE=0x2e000 +CONFIG_SPL_MAX_SIZE=0x1e000 CONFIG_SPL_PAD_TO=0x7f8000 CONFIG_HANDOFF=y # CONFIG_SPL_RAW_IMAGE_SUPPORT is not set diff --git a/configs/chromebook_kevin_defconfig b/configs/chromebook_kevin_defconfig index 48ee8b9fd258..8744152df61d 100644 --- a/configs/chromebook_kevin_defconfig +++ b/configs/chromebook_kevin_defconfig @@ -36,7 +36,7 @@ CONFIG_BOARD_EARLY_INIT_R=y CONFIG_BLOBLIST=y CONFIG_BLOBLIST_ADDR=0x100000 CONFIG_BLOBLIST_SIZE=0x1000 -CONFIG_SPL_MAX_SIZE=0x2e000 +CONFIG_SPL_MAX_SIZE=0x1e000 CONFIG_SPL_PAD_TO=0x7f8000 CONFIG_HANDOFF=y # CONFIG_SPL_RAW_IMAGE_SUPPORT is not set