U-Boot: Difference between revisions

Revision as of 06:10, 21 May 2016

U-Boot is a bootloader.

Instruction	Description	Command cycle	Bitlen	Source	Example
JEDEC-ID	JEDEC-ID Read	9FH	32		U-Boot > sspi 0x7100 32 9f000000 00BF2642
RDSR	Read the Status Register	05H	16	p. 10	U-Boot > sspi 0x7100 16 0500 0002
RDCR	Read the Configuration Register	35H	16		U-Boot > sspi 0x7100 16 3500 0008
WREN	Write-Enable: required for ULBPR, PP, ...	06H	8	p. 33	U-Boot > sspi 0x7100 8 06 00
WBPR	Write Block-Protection Register	42H	152	p. 36	U-Boot > sspi 0x7100 8 06 00 U-Boot > sspi 0x7100 152 42000000000000000000000000000000000000 00000000000000000000000000000000000000
RBPR	Read Block-Protection Register	72H	152	p. 35	U-Boot > sspi 0x7100 152 72000000000000000000000000000000000000 00FFFFFFFFFFFFFFFFFFFF0000000000000000
ULBPR	Global Block-Protection Unlock	98H	8	p. 39	U-Boot > sspi 0x7100 8 06 00 U-Boot > sspi 0x7100 8 98 00
Read (40MHz)		03H	N/A	p. 15	Read at offset 0 32 bits U-Boot > sspi 0x7100 64 0300000000000000 00000000FFFFFFFF
SE	Sector-Erase (change to 1) a 4KiB sector	20H	32	p. 25
PP	Page Program	02H	N/A	p. 28

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 U-Boot is a bootloader.
 == Communicate with the SST26VF032B<ref>http://ww1.microchip.com/downloads/en/DeviceDoc/20005218B.pdf</ref> ==
 {| class="wikitable"
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 |-
 |JEDEC-ID
-|
+|JEDEC-ID Read
 |9FH
 |32
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 |20H
 |32
-|
+|p. 25
 |
 |-
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 |02H
 |N/A
-|
+|p. 28
 |
 |}