tribes/guix
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/guix.git synced 2026-04-06 21:20:33 +02:00
Code Activity

gnu: bootloader: Add u-boot-am335x-evm-bootloader.

Browse Source 
* gnu/bootloader/u-boot.scm (u-boot-am335x-evm-bootloader):
  New exported variable.

Change-Id: I258f7b7b31e7b7597710b8ff30d7a5ed882e147c
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
Signed-off-by: Vagrant Cascadian <vagrant@debian.org>
This commit is contained in:
Denis 'GNUtoo' Carikli
2025-12-21 20:04:47 +01:00
committed by Vagrant Cascadian
parent 2f51ef95b4
commit 99b6b83230
1 changed files with 70 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
gnu/bootloader/u-boot.scm
View File

@@ -36,6 +36,7 @@
u-boot-a20-olinuxino-lime2-bootloader
u-boot-a20-olinuxino-micro-bootloader
u-boot-bananapi-m2-ultra-bootloader
u-boot-am335x-evm-bootloader
u-boot-beaglebone-black-bootloader
u-boot-cubietruck-bootloader
u-boot-firefly-rk3399-bootloader
@@ -97,6 +98,48 @@ is BLOCK-SIZE * COUNT, or FILE size if COUNT is not given."
(if bootloader
(error "Failed to install U-Boot"))))
(define install-am335x-evm-u-boot
(write-u-boot-image
;; According to the "26.1.8.5.5 MMC/SD Read Sector Procedure in Raw Mode"
;; section in the "AM335x and AMIC110 Sitara™ Processors Technical
;; Reference Manual", we have offset, the bootrom tries to load code at the
;; offsets 0x0, 0x20000 (128KB), 0x40000 (256KB) and 0x60000 (384KB).
;;
;; The MBR is 512 Bytes
;; (https://en.wikipedia.org/wiki/Master_boot_record#Sector_layout).
;;
;; At the time of writing, u-boot.img is 1.4 MiB, and it is at offset
;; 0x60000 (384KB) as per CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR.
;;
;; We also need to align the first partition to make sure read/writes are
;; properly aligned.
;;
;; Given these constraints, we chose the following partitioning:
;;
;; 0 512 Bytes 128 KiB
;; | | (0x20000) 256 KiB
;; | | / (0x40000) 384 KiB 4 MiB
;; | | / | (0x60000) |
;; | | / | | |
;; v v / v v v
;; +-------+ +--------------+---------------+----------------+
;; | MBR | ... | First MLO | Second MLO | u-boot.img |
;; +-------+ +--------------+---------------+----------------+
;; <-512 B-> ... <-- 128 KiB --> <-- 128 KiB --> <-- 3712 KiB -->
;;
;; The rationale for that is as follows:
;;
;; - We add a second copy of the MLO at 256 KiB for improving reliability
;; as the doc/board/ti/am335x_evm.rst documentation in u-boot advise us
;; to do that, and also because the space there isn't used.
;;
;; - All can fit into 2MiB (u-boot.img can grow up to 1664 KiB), but we
;; want a bit more space in case u-boot.img grows over time, so we allow
;; u-boot to grow until the 4 MiB offset.
'(("MLO" 256 256) ;; First MLO
("MLO" 256 512) ;; Second MLO
("u-boot.img" 7424 768)) 512))
(define install-beaglebone-black-u-boot
;; http://wiki.beyondlogic.org/index.php?title=BeagleBoneBlack_Upgrading_uBoot
;; This first stage bootloader called MLO (U-Boot SPL) is expected at
@@ -158,6 +201,33 @@ is BLOCK-SIZE * COUNT, or FILE size if COUNT is not given."
(installer #f)
(disk-image-installer install-u-boot)))
(define u-boot-am335x-evm-bootloader
(bootloader
(inherit u-boot-bootloader)
;; This bootloader supports the following computers:
;; - SanCloud BeagleBone Enhanced
;; - SanCloud BeagleBone Enhanced Extended WiFi
;; - SanCloud BeagleBone Enhanced Lite
;; - Seeed Studio BeagleBone Green Eco
;; - TI AM3359 ICE-V2
;; - TI AM335x BeagleBone
;; - TI AM335x BeagleBone Black
;; - TI AM335x BeagleBone Green
;; - TI AM335x EVM
;; - TI AM335x EVM-SK
;; - TI AM335x PocketBeagle
;;
;; This list was made by retrieving the list of Devicetrees used in
;; configs/am335x_evm_defconfig in u-boot source code. Once we have that we
;; can look at each Devicetree in arch/arm/boot/dts/ti/omap/ inside Linux,
;; and in each file, look at the model property to find the name of the
;; computers that this image supports.
(package u-boot-am335x-evm)
;; At the time of writing, our u-boot.img is 1.4 MiB. This is why we can't
;; reuse install-beaglebone-black-u-boot. And having the same image being
;; able to boot on multiple computers is useful.
(disk-image-installer install-am335x-evm-u-boot)))
(define u-boot-beaglebone-black-bootloader
(bootloader
(inherit u-boot-bootloader)