U-boot-V2: Introduce I2C support for SDP3430
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Cover letter [U-Boot-Users] [Patch 0/9] U-boot-V2: Introduce I2C support for SDP3430
Quoted 1 line · Nishanth
Please see U-boot v2 here:
Sorry, I didn't notice that your patch is for U-Boot V2.
Quoted 1 line
It does not have i2c support. And IMHO, using kernel like i2c addition in U-Boot v2 is appropriate. Why this is not a bloat U-Boot v2?
If it isn't, then it means that U-Boot V2 will be pretty bloated in general.
Quoted 5 lines
A) Now, if you just want
i2c_transferwithout any device interface, you don't need to compile in the CHARDEV.
B) Since we use a different linking strategy in U-Boot-v2 which uses gcc link stage to decide which functions be retained and which not, it is pretty neat to see all unused functionality disappear.
C) kernel has additional bus and class types which are useful when we think in terms of varied features, in u-boot v2, we don't have a bus and class, just a plain device+driver interface like the kernel + ioctls to allow "apps" to invoke functionality within the driver for the device. Very linux like, call it a micro-linux ;). So kernel i2c architecture fitsu_bootv2 better that u-boot v1's architecture.
D) U-boot v2 has insmod + rmmod -> though this is still to be fixed, once it is fully functioning, you can loadb just the module feature you need. In fact, you could even have a filesystem with just modules....
E) Ofcourse, we work in a single threaded, no interrupt mode in u-boot v2+ don't care for any power management -> more savings there
Sounds to me like U-Boot V2 is just a repacked Linux kernel. We could probably save ourselves a lot of trouble if we just took the DDR and CPU register initialization code in U-Boot and moved it to the kernel.
Signature · 2 lines
Timur Tabi Linux kernel developer at Freescale