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Adds code taken and (barely) adapted from U-Boot (release 2020.04,
commit 36fec02b1f90b92cf51ec531564f9284eae27ab4) for SDRAM initialization.
This should in theory work for other configurations than the Beaglebone
Black's DRAM configuration, but hasn't been tested.
Change-Id: Ib1bc2fa606f7010c8c789aa7a5c37cd41bc484b9
Signed-off-by: Sam Lewis <sam.vr.lewis@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44386
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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Adds a "sd_media" boot_device to allow booting from the SD card. This
assumes that the generated "MLO" file is placed at a 128KB offset from
the start of the SD card, to allow for the MBR etc. to be at the start
of the SD card. Placing the MLO file here allows the AM335x boot ROM to
load and execute the bootblock stage as well, as 128KB is one of the
offsets the boot ROM checks when looking for the next stage to execute.
As part of this, a FMD for the Beaglebone has also been defined. It's
sized at 32M somewhat arbitrarily, as SD cards could allow for much
bigger payloads.
TEST: Beaglebone boots from bootblock into romstage. Romstage to
ramstage still doesn't work as it needs RAM initialization first.
Change-Id: I5f6901217fb974808e84aeb679af2f47eeae30fd
Signed-off-by: Sam Lewis <sam.vr.lewis@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44385
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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Implements the monotonic timer using the am335x dmtimer peripheral.
Change-Id: I4736b6d3b6e26370be9e8f369fc02285ad519223
Signed-off-by: Sam Lewis <sam.vr.lewis@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44383
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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Allows the AM335X to boot from the coreboot generated MLO by:
- Fixing the load address in the MLO header to be the start of SRAM
- Fixing the way that the bootblock size is calculated (which is
embedded into the MLO so that the MLO knows how much to load into
SRAM). The previous method relied on parsing cbfstool output - the
output has changed format since this was originally written so this no
longer works. Directly using the filesize of the built binary is
probably a more stable way of doing this.
As part of this, the start addresses of SRAM and DRAM were fixed to be
consistent with the AM335x Technical Reference Manual (spruh73, rev Q).
TEST: Booted Beaglebone Black from MLO placed at offset 0x00 on an SD card
Change-Id: I514d7cda65ddcbf27e78286dc6857c9e81ce6f9e
Signed-off-by: Sam Lewis <sam.vr.lewis@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44381
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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The AM335X is a SoC, so should be in the soc tree.
This moves all the existing am335x code to soc/ and updates any
references. It also adds a soc.c file as required for the ramstage.
Change-Id: Ic1ccb0e9b9c24a8b211b723b5f4cc26cdd0eaaab
Signed-off-by: Sam Lewis <sam.vr.lewis@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44378
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
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