Difference between revisions of "Boot options (AxelLite)"
DevWikiAdmin (talk | contribs) (Created page with "{{InfoBoxTop}} {{AppliesToAxelLite}} {{InfoBoxBottom}} == System boot == The boot process begins at Power On Reset (POR) where the hardware reset logic forces the ARM core t...") |
DevWikiAdmin (talk | contribs) m (→SPI NOR / SD option) |
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Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows: | Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows: | ||
* BOOT_MODE_SEL = 0 | * BOOT_MODE_SEL = 0 | ||
| − | ** primary boot device is SD1 | + | ** primary boot device is SD1 |
| − | + | * in case no valid image is found in SD card, boot ROM shall enable USB serial download mode automatically | |
* BOOT_MODE_SEL = 1 or floating | * BOOT_MODE_SEL = 1 or floating | ||
| − | ** primary boot device is SPI NOR flash connected to eCSPI1 | + | ** primary boot device is SPI NOR flash connected to eCSPI1 |
| − | ** in case no valid image is found in NOR flash, boot ROM shall enable USB serial download mode automatically | + | ** in case no valid image is found in NOR flash, boot ROM shall enable USB serial download mode automatically |
| + | |||
=== NAND / SD option === | === NAND / SD option === | ||
Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows: | Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows: | ||
Revision as of 13:40, 9 April 2014
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System boot[edit | edit source]
The boot process begins at Power On Reset (POR) where the hardware reset logic forces the ARM core to begin execution starting from the on-chip boot ROM. The boot ROM:
- determines whether the boot is secure or non-secure
- performs some initialization of the system and clean-ups
- reads the mode pins to determine the primary boot device
- once it is satisfied, it executes the boot code
Boot options[edit | edit source]
Two options are available related to system boot. They are identified by the Boot field of the ordering code as follows:
- 0: SPI NOR / SD option (SOM code: DXLxxxx0xxR)
- 1: NAND / SD option (SOM code: DXLxxxx1xxR)
For both options the selection of primary boot device is determined by the BOOT_MODE_SEL signal as described in the following sections. BOOT_MODE_SEL is latched when processor reset is released.
In any case, boot process is managed by on-chip boot ROM code that is described in detail in processor's Reference Manual.
SPI NOR / SD option[edit | edit source]
Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows:
- BOOT_MODE_SEL = 0
- primary boot device is SD1
- in case no valid image is found in SD card, boot ROM shall enable USB serial download mode automatically
- BOOT_MODE_SEL = 1 or floating
- primary boot device is SPI NOR flash connected to eCSPI1
- in case no valid image is found in NOR flash, boot ROM shall enable USB serial download mode automatically
NAND / SD option[edit | edit source]
Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows:
- BOOT_MODE_SEL = 0
- primary boot device is SD1 (see section TBD for more details)
- in case no valid image is found in SD card, boot ROM shall enable USB serial download mode automatically
- BOOT_MODE_SEL = 1 or floating
- primary boot device is NAND flash (see section TBD for more details)
- in case no valid image is found in NAND flash, boot ROM shall enable USB serial download mode automatically
