[U-Boot] [PATCH v2] mx6sabresd: Add fastboot support

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam at nxp.com>

fastboot tool is a convenient way to flash the eMMC, so
add support for it.

Examples of usages:

On the mx6sabresd:

=> fastboot 0

On the Linux PC connected via USB:

$ sudo fastboot getvar bootloader-version -i 0x0525
bootloader-version: U-Boot 2018.01-00550-g7517cfe
finished. total time: 0.000s

Shawn Guo described the following method for flashing the eMMC
via flashboot:

"I booted the board into Debian via NFS, and then use gpart to create GPT
partitions on the eMMC.  With CONFIG_EFI_PARTITION enabled in U-Boot, I
can list the partitions on eMMC as below.

=> mmc dev 2
switch to partitions #0, OK
mmc2(part 0) is current device
=> mmc part

Partition Map for MMC device 2  --   Partition Type: EFI

Part    Start LBA       End LBA         Name
        Attributes
        Type GUID
        Partition GUID
  1     0x00000800      0x000407ff      "boot"
        attrs:  0x0000000000000000
        type:   21686148-6449-6e6f-744e-656564454649
        guid:   6137f187-600c-4dc4-8a74-ee8f0250d455
  2     0x00040800      0x002987ff      "system"
        attrs:  0x0000000000000000
        type:   0fc63daf-8483-4772-8e79-3d69d8477de4
        guid:   af78282f-21b5-4324-bf7a-f460d1ae0015
  3     0x00298800      0x003187ff      "vendor"
        attrs:  0x0000000000000000
        type:   0fc63daf-8483-4772-8e79-3d69d8477de4
        guid:   15830513-0195-4e86-9b2c-cd3af5e14570
  4     0x00318800      0x003587ff      "cache"
        attrs:  0x0000000000000000
        type:   0fc63daf-8483-4772-8e79-3d69d8477de4
        guid:   6e909a60-606b-4c43-bbd4-f780afd97302
  5     0x00358800      0x00ecbfde      "data"
        attrs:  0x0000000000000000
        type:   0fc63daf-8483-4772-8e79-3d69d8477de4
        guid:   9e79dc0b-35d9-40f0-b638-3e718362cb26
=> fastboot 0

At this point, I can do 'fastboot flash system system.img -i 0x0525' from
host PC."

Signed-off-by: Fabio Estevam <fabio.estevam at nxp.com>
---
Changes since v1:
- Select CONFIG_EFI_PARTITION=y (Shawn)
- Provide the eMMC flashing procedure (Michael)

 configs/mx6sabresd_defconfig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/configs/mx6sabresd_defconfig b/configs/mx6sabresd_defconfig
index 3e4c13c..9a4184b 100644
--- a/configs/mx6sabresd_defconfig
+++ b/configs/mx6sabresd_defconfig
@@ -20,6 +20,12 @@ CONFIG_SPL_USB_HOST_SUPPORT=y
 CONFIG_SPL_USB_GADGET_SUPPORT=y
 CONFIG_SPL_USB_SDP_SUPPORT=y
 CONFIG_HUSH_PARSER=y
+CONFIG_FASTBOOT=y
+CONFIG_FASTBOOT_BUF_ADDR=0x12000000
+CONFIG_FASTBOOT_BUF_SIZE=0x10000000
+CONFIG_FASTBOOT_USB_DEV=0
+CONFIG_FASTBOOT_FLASH=y
+CONFIG_FASTBOOT_FLASH_MMC_DEV=2
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_SPL=y
 CONFIG_CMD_SPL_WRITE_SIZE=0x20000
@@ -41,6 +47,7 @@ CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_EFI_PARTITION=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
-- 
2.7.4