Hi Peng
On 22/7/20 22:34, Peng Fan wrote:
Hi Walter,
Subject: [PATCH v2 0/6] mx6cuboxi: enable OF_PLATDATA with MMC support
The SPL in iMX6 boards is restricted to 68 KB as this is the free available space in OCRAM for most revisions. In this context, adding OF_CONTROL and DM increases the SPL size which could make it difficult to add specific features required for custom scenarios.
These patches aim to take advantage of OF_PLATADATA in order to reduce the SPL size in this scenario, by parsing DT data to generate platdata structures, and thus removing the overhead caused by DT and related libraries.
This series is focused in MMC driver, which is used for boot in boards such as Cubox-i. Also, in order to support CD, the OF_PLATDATA support is also implemented on GPIO driver.
Do you have some data that how much is decreased using OF_PLATDATA?
Yes, I updated the commit message on Patch 6/6, but should have updated the cover letter. With OF_PLATDATA enabled the reduction on mx6cuboxi_defconfig is 5 KB, which is half of the overhead introduced by DM on this config. Additionally, I've in my backlog some additional patches for further improvements.
Regards,
Walter
Changes in v2:
- Improve commit message with footprint reduction
Walter Lozano (6): mmc: fsl_esdhc_imx: rename driver name to match ll_entry mmc: fsl_esdhc_imx: add OF_PLATDATA support gpio: mxc_gpio: add OF_PLATDATA support mmc: fsl_esdhc_imx: add CD support when OF_PLATDATA is enabled drivers: rename more drivers to match compatible string mx6cuboxi: enable OF_PLATDATA
configs/mx6cuboxi_defconfig | 1 + drivers/gpio/mxc_gpio.c | 18 +++++- drivers/mmc/fsl_esdhc_imx.c | 94 +++++++++++++++++++++++++----- drivers/pinctrl/nxp/pinctrl-imx6.c | 6 +- drivers/video/imx/mxc_ipuv3_fb.c | 4 +- 5 files changed, 103 insertions(+), 20 deletions(-)
-- 2.20.1