On 26/10/18 8:53 PM, 陈北宗 wrote:
Dear List:
Hello.
I am in the middle of cooking up a V3s experiment board. For that board I want
to allow the board to boot even without a microSD card installed. SD0 is the
microSD slot, SD1 is being used to interface a SDIO Wi-Fi module, and only the
SD2/SPI0 port is open.
I know that I can just put an eMMC chip on SD2, but that seemed wasteful to me
since that interface is limited to only 1-bit operation (while on my other
board I has 8-bit eMMC on A13’s 8-bit SD2, making full use of it.) A cheaper
alternative is using a 64MiB SPI NOR Flash as the onboard storage holding the
complete OS and application image in it, but that would require u-boot support
for SPI boot.
How is the status of SPI in u-boot?
Try this driver[1] from this branch[2]. This clk branch need to mature
further to merge into mainline, probably on version.
[2] http://git.denx.de/?p=u-boot-sunxi.git;a=shortlog;h=refs/heads/clk
[1]
http://git.denx.de/?p=u-boot-sunxi.git;a=commitdiff;h=ad91013102eba6c634adea1ecf767b58dec44492
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