Hi Peng,
On Thu, May 16, 2019 at 11:29 PM Peng Fan peng.fan@nxp.com wrote:
You could enable DEBUG in SPL, and disable SPL_SDP because of size will exceeds. Then see what happends. I have no idea, then. My board is REV C4, chip 1.5
My mx6qsabresd is revC2, with a i.MX6Q rev 1.2 populated.
After further investigation we can confirm that the problem is caused by SPL size being greater than the 68kB limit (4KB header + 64KB max size)as explained in include/configs/imx6_spl.h:
--------------- #ifndef __IMX6_SPL_CONFIG_H #define __IMX6_SPL_CONFIG_H
#ifdef CONFIG_SPL /* * see Figure 8-3 in IMX6DQ/IMX6SDL Reference manuals: * - IMX6SDL OCRAM (IRAM) is from 0x00907000 to 0x0091FFFF * - IMX6DQ has 2x IRAM of IMX6SDL but we intend to support IMX6SDL as well * - BOOT ROM stack is at 0x0091FFB8 * - if icache/dcache is enabled (eFuse/strapping controlled) then the * IMX BOOT ROM will setup MMU table at 0x00918000, therefore we need to * fit between 0x00907000 and 0x00918000. * - Additionally the BOOT ROM loads what they consider the firmware image * which consists of a 4K header in front of us that contains the IVT, DCD * and some padding thus 'our' max size is really 0x00908000 - 0x00918000 * or 64KB */ #define CONFIG_SPL_MAX_SIZE 0x10000 #define CONFIG_SPL_STACK 0x0091FFB8 /* * Pad SPL to 68KB (4KB header + 64KB max size). This allows to write the * SPL/U-Boot combination generated with u-boot-with-spl.imx directly to a * boot media (given that boot media specific offset is configured properly). */ #define CONFIG_SPL_PAD_TO 0x11000 ---------------
Here are the tests I ran:
Test 1: Original U-Boot 2019.07-rc2 -----------------------------------------------
SPL: 76800 (75 kB) Result: does not boot
Test 2: Removing extra dtbs -------------------------------------
--- a/configs/mx6sabresd_defconfig +++ b/configs/mx6sabresd_defconfig @@ -59,10 +59,10 @@ CONFIG_EFI_PARTITION=y CONFIG_OF_CONTROL=y CONFIG_SPL_OF_CONTROL=y CONFIG_DEFAULT_DEVICE_TREE="imx6q-sabresd" -CONFIG_OF_LIST="imx6q-sabresd imx6qp-sabresd imx6dl-sabresd" +CONFIG_OF_LIST="imx6q-sabresd" CONFIG_MULTI_DTB_FIT=y CONFIG_SPL_MULTI_DTB_FIT=y -CONFIG_SPL_OF_LIST="imx6dl-sabresd imx6q-sabresd imx6qp-sabresd" +CONFIG_SPL_OF_LIST="imx6q-sabresd" CONFIG_ENV_IS_IN_MMC=y CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y CONFIG_SPL_DM=y
SPL:68608 (67 kB) Result: boots correctly
Test 3: Removing SPL_DM ------------------------------------
--- a/configs/mx6sabresd_defconfig +++ b/configs/mx6sabresd_defconfig @@ -65,7 +65,6 @@ CONFIG_SPL_MULTI_DTB_FIT=y CONFIG_SPL_OF_LIST="imx6dl-sabresd imx6q-sabresd imx6qp-sabresd" CONFIG_ENV_IS_IN_MMC=y CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y -CONFIG_SPL_DM=y CONFIG_USB_FUNCTION_FASTBOOT=y CONFIG_FASTBOOT_BUF_ADDR=0x12000000 CONFIG_FASTBOOT_BUF_SIZE=0x10000000
SPL: 68608 (67 kB) Result: boots correctly
I will send a v2 removing CONFIG_SPL_DM.
Also, the SPL size check should be really done after the multi fit image is concatenated so that we can have a chance to detect such size overflow in build time.
Thanks